Method and apparatus for efficient encoding of large data words at high code rates

ABSTRACT

Methods of encoding and decoding as well as an encoder and decoder are provided for encoding data words into codewords and decoding codewords into data words. The data words are encoded by mapping each data word into a number of data segments. Each data segment is then encoded to form a codeword segment that has the same number of bits as the data word segment. The codeword segments are concatenated to form the codeword. The codewords are decoded by decoding individual codeword segments into data word segments that are the same size as the codeword segments. The data word segments are then mapped into the data word, which has fewer bits than the total number of bits across all data word segments.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority from U.S. Provisional Application having serial No. 60/210,641, filed on Jun. 9, 2000, and entitled EFFICIENT BLOCK CODE IMPLEMENTATION FOR VERY LARGE CODEWORDS and U.S. Provisional Application having serial No. 60/212,547, filed on Jun. 20, 2000, and entitled SEQUENTIAL ENCODER/DECODER IMPLEMENTATION FOR BLOCK CODES WITH LARGE CODEWORDS.

FIELD OF THE INVENTION

[0002] The present invention relates to encoding systems. In particular, the present invention relates to encoding systems in disc drives.

BACKGROUND OF THE INVENTION

[0003] In the field of digital communications, digital information is conveyed from a transmitter to a receiver through a channel. “Channel” is a generalized term that can include many things. For instance, in satellite communication systems, the channel consists of the atmosphere between an earth-bound transmitter and a satellite. In data storage devices, such as magnetic disc drives, the channel includes a storage medium where the signal is stored for some period of time before being delivered to the receiver.

[0004] All channels introduce noise into the signals they convey. To detect and sometimes to correct errors caused by this channel noise, the art has developed a large number of coding techniques. These coding techniques convert data words formed of “m′” data bits into larger codewords formed of “n” code bits. The additional bits in the codewords permit the detection and sometimes the correction of errors in the signals received from the channel.

[0005] The ratio of the number of data bits to the number of code bits, m/n, is known as the code rate of the code. In general, the ability to detect and correct errors in a received signal increases as the code rate decreases because a lower code rate means a greater number of additional bits in the codeword. However, each additional bit added by the encoder increases the time and energy needed to transmit the signal through the channel. Thus, to minimize the time and energy needed to send the code, the code rate should be maximized.

[0006] In one type of coding, known as Non-Return-to-Zero Inverse (NRZI), every digital one in a codeword is represented by a transition in the transmitted signal, and every digital zero is represented by a lack of transitions in the transmitted signal. To allow the receiver to generate a clock signal from the received signal, the encoded signal is generally limited so that the number of consecutive zeros is no greater than a maximum number “k”. This kind of code is known as a run-length-limited (RLL) code with a “k” constraint.

[0007] It is also known to limit the number of consecutive ones codewords to limit the effects of inter-symbol interference, which occurs when consecutive transitions in the transmitted signal interfere with each other. This is sometimes done by requiring some number, d, of zeros between ones. An RLL code with a d and k constraint are usually referred to as a (d, k) RLL code.

[0008] To achieve higher code rates, the number of bits being encoded can be increased. For example, a 64/65 code has a higher code rate than a 17/18 code. However, with each additional bit in the input data word, the number of possible input data words increases by a multiple of 2. Thus, there are twice as many possible 64-bit data words (2⁶⁴) as there are 63-bit data words (2⁶³).

[0009] For even modest data word sizes, the number of available data words makes encoding through a simple table look-up inefficient. For example, for a word length of 20 bits, a table look-up encoding scheme would need to search a database of 2²⁰ (1,048,576) entries. Thus, a system is needed for encoding and decoding large words without using a large look-up table.

[0010] The present invention addresses this and other problems, and offers other advantages over the prior art.

SUMMARY OF THE INVENTION

[0011] Methods of encoding and decoding as well as an encoder and decoder are provided for encoding data words into codewords and decoding codewords into data words. The data words are encoded by mapping each data word into a number of data segments. Each data segment is then encoded to form a codeword segment that has the same number of bits as the data word segment. The codeword segments are concatenated to form the codeword. The codewords are decoded by decoding individual codeword segments into data word segments that are the same size as the codeword segments. The data word segments are then mapped into the data word, which has fewer bits than the total number of bits across all data word segments.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012]FIG. 1 is a perspective view of disc drive in which aspects of the present invention may be practiced.

[0013]FIG. 2 is a block diagram of a read channel.

[0014]FIG. 3 is a block diagram of a parallel encoder under one embodiment of the present invention.

[0015]FIG. 4 is a block diagram of a parallel decoder under one embodiment of the present invention.

[0016]FIG. 5 is a more detailed block diagram of one embodiment of mapping unit 302 of FIG. 3.

[0017]FIG. 6 is a block diagram of one embodiment of inverse mapping unit 432 of FIG. 4.

[0018]FIG. 7 is a block diagram of one embodiment of a segment encoder under the present invention.

[0019]FIG. 8 is a block diagram of a second embodiment of a segment encoder under the present invention.

[0020]FIG. 9 is a block diagram of a second embodiment of a segment decoder under the present invention.

[0021]FIG. 10 is a block diagram of a sequential encoder under an embodiment of the present invention.

[0022]FIG. 11 is a block diagram of a sequential decoder under an embodiment of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

[0023]FIG. 1 is a perspective view of a disc drive 100 in which the present invention is useful. Disc drive 100 includes a housing with a base 102 and a top cover (not shown). Disc drive 100 further includes a disc pack 106, which is mounted on a spindle motor (not shown), by a disc clamp 108. Disc pack 106 includes a plurality of individual discs, which are mounted for co-rotation about central axis 109. Each disc surface has an associated disc head slider 110 which is mounted to disc drive 100 for communication with the disc surface. In the example shown in FIG. 1, sliders 110 are supported by suspensions 112 which are in turn attached to track accessing arms 114 of an actuator 116. The actuator shown in FIG. 1 is of the type known as a rotary moving coil actuator and includes a voice coil motor (VCM), shown generally at 118. Voice coil motor 118 rotates actuator 116 with its attached heads 110 about a pivot shaft 120 to position heads 110 over a desired data track along an arcuate path 122 between a disc inner diameter 124 and a disc outer diameter 126. Voice coil motor 118 is driven by servo electronics located in electronics 130 based on signals generated by heads 110 and a host computer (not shown).

[0024]FIG. 2 is a block diagram of a generalized communication system 148 used with the present invention. For the disc drive of FIG. 1, communication system 148 is formed by head 110, disc 106, and internal logic in electronics 130. Within communication system 148, an encoder 150 receives data samples 152 and produces codewords 153. Codewords 153 are provided to parallel-to-serial converter 155 in a parallel manner such that all of the bits of a respective codeword are provided to converter 155 at the same time. Parallel-to-serial converter 155 converts each parallel codeword 153 into a serial representation and concatenates the serial representations to produce a sequence of bits 154. The sequence of bits 154 meets several constraints discussed further below.

[0025] Transmitter/channel precoder 156 receives the sequence of bits 154 and conditions the sequence so that it is optimized for the type of detector used to recover the signal from the channel. Transmitter/channel precoder 156 produces write signal 158, which is provided to channel 160.

[0026] Channel 160, which is comprised of a write head, a disc, and a read head when the communication system is a disc drive, conveys the encoded information from transmitter/precoder 156 to receiver/detector 162 as a read signal 164. Receiver/detector 162 amplifies and filters read signal 164 and recovers an encoded signal from the read signal using one of several known detection methods. For instance, receiver/detector 162 may use a Viterbi detector, Decision Feedback Equalization (DFE), Fixed-Delay Tree Search with Decision Feedback (FDTS/DF) or Reduced State Sequence detection (RSSE).

[0027] After detecting and amplifying the signal from channel 160, receiver/detector 162 produces a recovered sequence of bits 165, which are provided to serial-to-parallel converter 163. Sequence of bits 165 is in a serial format at the input to serial-to-parallel converter 163. Serial-to-parallel converter 163 groups the bits into codewords and converts the codewords from a serial format to a parallel format. Serial-to-parallel converter 163 then outputs codewords 166 in a parallel format to decoder 168. Decoder 168 uses the inverse of the coding rules used by encoder 150 and converts the codewords 166 into recovered data stream 170.

[0028] The present invention provides an improved encoder and decoder that make it possible to encode large data words into large codewords while maintaining a rate of n/n+1, where n is the number of bits in the input data word. In addition, the present invention divides the task of encoding such that parallel encoders may be used or a single encoder may be used repeatedly to encode a single data word. The present invention allows for these benefits by performing an initial remapping of the data word from n bits to a collection of smaller data word segments that together have n+1 bits. Each data word segment is encoded to achieve the desired RLL constraints and the resulting codeword segments are then combined to form a single codeword of n+1 bits.

[0029] The encoding that is performed converts data segments with (n+1)/x bits into the codeword segments with (n+1)/x bits, where x is the number of segments. Because there are an equal number of bits on each side of the encoder, the data segments at the input to the encoder must be limited to only a subset of their possible values. Thus, the mapping of the data word into data segments is performed such that the data segments can only have a limited number of values. Under preferred embodiments, each of the data segments is limited to the same set of values so that the same segment block encoder may be used to encode each data segment.

[0030] The present inventors have found that the number of allowed values for each data segment when taken to the power of x, where x is the number of data segments, should be greater than but as close as possible to ½ the number of possible values for the n+1 bit codewords. The combination of the data segments must have at least ½ the values of the n+1 bit codewords so that they can represent each of the n data words. However, the number of possible values for the data segments should be as close to ½ as possible so as to maximize the number of extra codewords, thereby allowing greater flexibility in encoding the data segments to meet the RLL constraints.

[0031]FIG. 3 provides a general block diagram of a parallel encoder under one embodiment of the present invention. In FIG. 3, a data word 300 having n bits is provided to a mapping unit 302. Mapping unit 302 maps the data word into a collection of x data segments, which are represented in FIG. 3 by data segments 304, 306, 308, 310 and 312 (also designated as DSA, DSB, DSC, DSD, and DSX). Each of the data segments has (n+1)/x bits.

[0032] Each data segment is provided to a segment block encoder such as block encoders 314, 316, 318, 320 and 322. Each segment block encoder converts the data segment into a codeword segment, which also has (n+1)/x bits. In FIG. 3, this results in codeword segments 324, 326, 328, 330, and 332, which are concatenated to form a codeword 334 having n+1 bits.

[0033] Each segment block encoder is capable of enforcing a required RLL constraint. In addition, the encoders can maintain a minimum Hamming weight, which is a minimum number of ones in each codeword segment. As mentioned above, in preferred embodiments, each segment block encoder is identical to the other segment block encoders. This simplifies the design and manufacturing of the complete encoder.

[0034]FIG. 4 provides a block diagram of a parallel decoder under one embodiment of the present invention. In FIG. 4, a codeword 400 with n+1 bits is divided into x code segments each having (n+1)/x bits. These code segments are represented by segments 402, 404, 406, 408 and 410 in FIG. 4.

[0035] Each code segment is provided to a segment block decoder such as segment block decoders 412, 414, 416, 418, and 420 of FIG. 4. These segment block decoders decode the code segments into data segments such as data segments 422, 424, 426, 428 and 430. The segment block decoders perform the inverse coding function of the encoders shown in FIG. 3.

[0036] The decoded data segments are then provided to an inverse mapping unit 432, which provides an inverse of the mapping function of mapping unit 302 of FIG. 3. The results of the inverse mapping is an n-bit data word 434.

[0037]FIG. 5 provides one embodiment of mapping unit 302 of FIG. 3 for mapping the data word into data segments. In the embodiment of FIG. 5, a 64-bit data word is mapped into five 13-bit data segments. In FIG. 5, the 64-bit data word 500 is first divided into a 14-bit word 502 and a 50-bit word 504. Note that all 64 bits of data word 500 do not have to be present at the same time. Instead, the bits of the data word can appear serially. Also note that no particular set of the 64 bits must be divided to form 14-bit word 502 or 50-bit word 504 as long as the selection is consistently made for each 64-bit data word.

[0038] Fifty-bit word 504 is divided into five 10-bit words 506, 508, 510, 512, and 514. As with the 64-bit word, 50-bit word 504 does not need to have all of its bits present at the same time. Instead, the bits may appear serially and may be assigned to the 10-bit words as they appear.

[0039] Fourteen-bit word 502 is provided to a simplified mapping unit 516 when all 14 bits are present. Simplified mapping unit 516 maps the 14 bits into five 3-bit segments 518, 520, 522, 524, and 526. In performing the mapping, simplified mapping unit 516 limits each of the output 3-bit segments to a subset of the eight possible values for a 3-bit segment. For example, under one particular embodiment, simplified mapping unit 516 limits each 3-bit segment to seven of the eight possible values. In the embodiment of FIG. 5, any seven of the eight valid values may be used, although under some embodiments of the present invention a particular value is excluded from the set of valid values to achieve a coding benefit as described further below.

[0040] Each 3-bit segment is then concatenated with a respective 10-bit segment to form the 13-bit data segment. Thus, 3-bit segment 518 is concatenated with the 10-bit 506 to form 13-bit data segment 528. Similar concatenations result in 13-bit segments 530, 532, 534, and 536.

[0041] One method for performing the simplified mapping in simplified mapping unit 516 is to convert 14-bit value 502 into a base seven representation of the that value where each 3-bit segment represents a base seven digit. By converting the 14-bit input into a 15-bit base seven representation of that 14-bit value, the mapping ensures that each of the 3-bit digits will be limited to seven of eight values. In its simplest form, this mapping would exclude the value 111, which equals 8, from each of the 3-bit values. In other embodiments, after the base seven conversion, a different value is substituted for the 111 value as the invalid value. To perform this swap, any values that take on the newly designated invalid value are given the value of 111.

[0042] In other embodiments, the mapping from a 14-bit word to five 3-bit words is performed based on the strategy of mapping data bits directly to intermediate bits if the data words do not include three ones. Thus, for 14 bits of data (W13, W12, W11, W10, W9, W8, W7, W6, W5, W4, W3, W2, W1, W0) the five groups of output bits (I14, I13, I12) (I11, I10, I9) (I8, I7, I6) (I5, I4, I3) and (I2, I1, I0) are formed using the following mapping: TABLE 1 W14 W13 W12 W11 W10 W9 W8 W7 W6 W5 W4 W3 W2 W1 W0 0 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0

[0043] Thus, if none of the four groups (W11, W10, W9) (W8, W7, W6) (W5, W4, W3) or (W2, W1, W0) contain “111” the 14-bit data word can be mapped to the 15-bit codeword using table 1 above. If, however, one of these four groups contains “111” a valid value must be used in place of the invalid value. This mapping is defined through logical equations as follows:

[0044] G4=I13 & I12

[0045] G3=I11 & I10 & I9

[0046] G2=I8 & I7 & I6

[0047] G1=I5 & I4 & I3

[0048] G0=I2 & I1 & I0

[0049] HH=!G3 & !G2 & !G1 & !G0

[0050] H0=!G3 & !G2 & !G1 & G0

[0051] H1=!G3 & !G2 & G1 & !G0

[0052] H2=!G3 & G2 & !G1 & !G0

[0053] H3=G3 & !G2 & !G1 & !G0

[0054] H01=!G3 & !G2 & G1 & G0

[0055] H02=!G3 & G2 & !G1 & G0

[0056] H03=G3 & !G2 & !G1 & G0

[0057] H12=!G3 & G2 & G1 & !G0

[0058] H13=G3 & !G2 & G1 & !G0

[0059] H23=G3 & G2 & !G1 & !G0

[0060] H012=!G3 & G2 & G1 & G0

[0061] H013=G3 & !G2 & G1 & G0

[0062] H023=G3 & G2 & !G1 & G0

[0063] H123=G3 & G2 & G1 & !G0

[0064] H0123=G3 & G2 & G1 & G0

[0065] JK=!HH

[0066] JJ=(JK & !G4)

[0067] KK=(JK & G4)

[0068] T2=(!H0 & !H1 & !H2 & !H3)

[0069] T3=H012|H013|H023|H123|H0123

[0070] J6d9=(H0|H1|H2)

[0071] J3d9=(H01|H02|H12)

[0072] J3d6=(H0|H1|H03|H13)

[0073] J3d3=(H2|H3|H23)

[0074] J0d6=(H01|H013)

[0075] J0d3=(H0|H02|H03|H023)

[0076] J0d0=(H1|H2|H3|H12|H13|H23|H123)

[0077] J11=T2

[0078] J10=(H2|H3)

[0079] J9=(H1|H3)

[0080] J8=(I11 & J6d9)|(I8 & H3)|H13|H23|T3

[0081] J7=(I10 & J6d9)|(I7 & H3)|H03|H12|T3

[0082] J6=(I9 & J6d9)|(I6 & H3)|H02|H12|H23

[0083] J5=(I11 & J3d9)|(I8 & J3d6)|(I5 & J3d3)|H0123

[0084] J4=(I10 & J3d9)|(I7 & J3d6)|(I4 & J3d3)|H012|H013

[0085] J3=(I9 & J3d9)|(I6 & J3d6)|(I3 & J3d3)|H012|H023

[0086] J2=(I11 & H012)|(I8 & J0d6)|(I5 & J0d3)|(I2 & J0d0)

[0087] J1=(I10 & H012)|(I7 & J0d6)|(I4 & J0d3)|(I1 & J0d0)

[0088] J0=(I9 & H012)|(I6 & J0d6)|(I3 & J0d3)|(I0 & J0d0)

[0089] W14=JK

[0090] W13=(I13 & (HH|JJ))|(KK & T2)

[0091] W12=(I12 & (HH|JJ))|(KK & (H2|H3))

[0092] W11=(I11 & HH)|(J11 & JJ)|(KK)

[0093] W10=(I10 & HH)|(J10 & JJ)|(KK & (H1|H3))

[0094] W9=(I9 & HH)|(J9 & JJ)|(KK & (H0|H2|T2))

[0095] W8=(I8 & HH)|(J8 & JK)

[0096] W7=(I7 & HH)|(J7 & JK)

[0097] W6=(I6 & HH)|(J6 & JK)

[0098] W5=(I5 & HH)|(J5 & JK)

[0099] W4=(I4 & HH)|(J4 & JK)

[0100] W3=(I3 & HH)|(J3 & JK)

[0101] W2=(I2 & HH)|(J2 & JK)

[0102] W1=(I1 & HH)|(J1 & JK)

[0103] W0=(I0 & HH)|(J0 & JK)

[0104] Where “&” indicates a logical AND operation, “|” indicates a logical OR operation, and “!” indicates a logical NOT operation.

[0105] The mapping defined by the logical equations above is described by two tables. Each table is associated with a value for the group (D13, D12). If this group has a value that is not equal to “11” then the mapping is described by table 2 below as: TABLE 2 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 1 D13 D12 0 0 0 D11 D10 D9 D8 D7 D6 D5 D4 D3 1 D13 D12 0 0 1 D11 D10 D9 D8 D7 D6 D2 D1 D0 1 D13 D12 0 1 0 D11 D10 D9 D5 D4 D3 D2 D1 D0 1 D13 D12 0 1 1 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 D13 D12 1 0 0 0 0 0 D11 D10 D9 D8 D7 D6 1 D13 D12 1 0 0 0 0 1 D11 D10 D9 D5 D4 D3 1 D13 D12 1 0 0 0 1 0 D8 D7 D6 D5 D4 D3 1 D13 D12 1 0 0 0 1 1 D11 D10 D9 D2 D1 D0 1 D13 D12 1 0 0 1 0 0 D8 D7 D6 D2 D1 D0 1 D13 D12 1 0 0 1 0 1 D5 D4 D3 D2 D1 D0 1 D13 D12 1 0 0 1 1 0 0 1 1 D11 D10 D9 1 D13 D12 1 0 0 1 1 0 0 1 0 D8 D7 D6 1 D13 D12 1 0 0 1 1 0 0 0 1 D5 D4 D3 1 D13 D12 1 0 0 1 1 0 0 0 0 D2 D1 D0 1 D13 D12 1 0 0 1 1 0 1 0 0 0 0 0

[0106] TABLE 3 If grouping (D13, D12) is equal to “11”, then the mapping is: C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 1 0 0 1 0 1 D11 D10 D9 D8 D7 D6 D5 D4 D3 1 0 0 1 1 0 D11 D10 D9 D8 D7 D6 D2 D1 D0 1 0 1 1 0 1 D11 D10 D9 D5 D4 D3 D2 D1 D0 1 0 1 1 1 0 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 1 0 1 0 1 0 0 0 D11 D10 D9 D8 D7 D6 1 1 0 1 0 1 0 0 1 D11 D10 D9 D5 D4 D3 1 1 0 1 0 1 0 1 0 D8 D7 D6 D5 D4 D3 1 1 0 1 0 1 0 1 1 D5 D10 D9 D2 D1 D0 1 1 0 1 0 1 1 0 0 D8 D7 D6 D2 D1 D0 1 1 0 1 0 1 1 0 1 D5 D4 D3 D2 D1 D0 1 1 0 1 0 1 1 1 0 0 1 1 D11 D10 D9 1 1 0 1 0 1 1 1 0 0 1 0 D8 D7 D6 1 1 0 1 0 1 1 1 0 0 0 1 D5 D4 D3 1 1 0 1 0 1 1 1 0 0 0 0 D2 D1 D0 1 1 0 1 0 1 1 1 0 1 0 0 0 0 0

[0107]FIG. 6 provides a block diagram of one embodiment of inverse mapping unit 430 of FIG. 4. In FIG. 6, five data segments 600, 602, 604, 606, and 608 that each have 13 bits are received from the segment decoders of FIG. 4. Each data segment has its first three bits separated from its remaining 10 bits to produce 3-bit segments 610, 612, 614, 616, and 618 and 10-bit segments 620, 622, 624, 626, and 628.

[0108] Three-bit segments 610, 612, 614, 616, and 618 are provided to a simplified inverse mapping unit 630 which maps the 15 bits into a 14-bit portion 632 of the data word. This inverse mapping is the inverse of the mapping performed by simplified mapping unit 516 of FIG. 5.

[0109] Ten-bit segments 620, 622, 624, 626 and 628 are combined to form a 50-bit portion 634. Fourteen-bit portion 632 is then combined with 50-bit portion 634 to form 64-bit data word 636. During the combination, the bits of 14-bit portion 632 and 50-bit portion 634 are assigned bit locations in the 64-bit word based on an inverse of the mapping used in FIG. 5 to divide the data word into a 14-bit portion and a 50-bit portion. The resulting bits of the 64-bit data word may be produced in a parallel manner or serially.

[0110] The operation of one embodiment of inverse mapping unit 630 is described below with logical equations where the 15-bit input to inverse mapping unit 630 is represented by W14-I0 and the 14-bit output is represented by I13-40. This mapping represents the inverse of the mapping unit described above by tables 2 and 3. The logical equations describing the inverse mapping are:

[0111] HH=!W14

[0112] JK=W14

[0113] JJ=(!W11|(!W10 & !W9)) & JK

[0114] KK=!JJ & JK

[0115] H0=(!W11 & !W10 & !W9 & JJ)|(!W13 & !W12 & W11 & !W10 & W9 & KK)

[0116] H1=(!W11 & !W10 & W9 & JJ)|(!W13 & !W12 & W11 & W10 & !W9 & KK)

[0117] H2=(!W11 & W10 & !W9 & JJ)|(!W13 & W12 & W11 & !W10 & W9 & KK)

[0118] H3=(!W11 & W10 & W9 & JJ)|(!W13 & W12 & W11 & W10 & !W9 & KK)

[0119] T2=(W11 & !W10 & !W9 & JJ)|(W13 & !W12 & W11 & !W10 & W9 & KK)

[0120] H01=!W8 & !W7 & !W6 & T2

[0121] H02=!W8 & !W7 & W6 & T2

[0122] H03=!W8 & W7 & !W6 & T2

[0123] H12=!W8 & W7 & W6 & T2

[0124] H13=W8 & !W7 & !W6 & T2

[0125] H23=W8 & !W7 & W6 & T2

[0126] T3=W8 & W7 & !W6 & T2

[0127] H012=!W5 & W4 & W3 & T3

[0128] H013=!W5 & W4 & !W3 & T3

[0129] H023=!W5 & !W4 & W3 & T3

[0130] H123=!W5 & !W4 & !W3 & T3

[0131] H0123=W5 & !W4 & !W3 & T3

[0132] J9c6=(H0|H1|H2)

[0133] J9c3=(H01|H02|H12)

[0134] J9c0=H012

[0135] J9ca=(H3|H03|H13|H23|H123|H023|H013|H0123)

[0136] J6c6=H3

[0137] J6c3=(H0|H1|H03|H13)

[0138] J6c0=(H01|H013)

[0139] J6ca=(H2|H02|H12|H23|H123|H023|H012|H0123)

[0140] J3c3=(H2|H3|H23)

[0141] J3c0=(H0|H02|H03|H023)

[0142] J3ca=(H1|H01|H12|H13|H123|H013|H012|H0123)

[0143] J0c0=(H1|H2|H3|H12|H13|H23|H123)

[0144] J0ca=(H0|H01|H02|H03|H023|H013|H012|H0123)

[0145] J11=(W8 & J9c6)|(W5 & J9c3)|(W2 & J9c0)|J9ca

[0146] J10=(W7 & J9c6)|(W4 & J9c3)|(W1 & J9c0)|J9ca

[0147] J9=(W6 & J9c6)|(W3 & J9c3)|(W0 & J9c0)|J9ca

[0148] J8=(W8 & J6c6)|(W5 & J6c3)|(W2 & J6c0)|J6ca

[0149] J7=(W7 & J6c6)|(W4 & J6c3)|(W1 & J6c0)|J6ca

[0150] J6=(W6 & J6c6)|(W3 & J6c3)|(W0 & J6c0)|J6ca

[0151] J5=(W5 & J3c3)|(W2 & J3c0)|J3ca

[0152] J4=(W4 & J3c3)|(W1 & J3c0)|J3ca

[0153] J3=(W3 & J3c3)|(W0 & J3c0)|J3ca

[0154] J2=(W2 & J0c0)|J0ca

[0155] J1=(W1 & J0c0)|J0ca

[0156] J0=(W0 & J0c0)|J0ca

[0157] I13=(W13 & (HH|JJ))|(KK)

[0158] I12=(W12 & (HH|JJ))|(KK)

[0159] I11=(W11 & HH)|(J11 & JK)

[0160] I10=(W10 & HH)|(J10 & JK)

[0161] I9=(W9 & HH)|(J9 & JK)

[0162] I8=(W8 & HH)|(J8 & JK)

[0163] I7=(W7 & HH)|(J7 & JK)

[0164] I6=(W6 & HH)|(J6 & JK)

[0165] I5=(W5 & HH)|(J5 & JK)

[0166] I4=(W4 & HH)|(J4 & JK)

[0167] I3=(W3 & HH)|(J3 & JK)

[0168] I2=(W2 & HH)|(J2 & JK)

[0169] I1=(W1 & HH)|(J1 & JK)

[0170] I0=(W0 & HH)|(J0 & JK)

[0171] The segment block encoder may be used to enforce any number of desired RLL constraints and Hamming weights. The k constraint for a RLL code can be determined as:

k=max (k _(b) +k _(e) , k _(m))

[0172] where k_(b) equals the maximum run of zeros at the beginning of the code segment; k_(m) equals the maximum run of zeros at the middle of the code segment; and k_(e) equals the maximum run of zeros at the end of the code segment.

[0173] Table 4 below shows the number of 13-bit code segment values available for a number of different k constraints and Hamming weights. TABLE 4 Hamming Number of 13 bit Code Segment k k_(b) k_(m) k_(e) Weight values available 6 3 6 3 2 7073 7 4 6 3 4 7196 7 4 6 3 3 7306 8 4 7 4 4 7251 7 4 7 3 3 7381

[0174] In order to provide a 1-to-1 mapping, the constraints must allow for at least 7,168 code values. Thus, from Table 4, it can be seen that all of the constraints except the constraints in the first row may be applied to a segment block encoder under the present invention.

[0175] Under one embodiment of the present invention, a code is implemented that has a (0, 7) RLL constraint with km equal to 6 and a minimum Hamming weight of 4. For this particular encoder, a simplified mapping unit is assumed that sets the first three bits of the 13-word bit word using a base 7 conversion as discussed above. This base 7 conversion eliminates the value of “000” for each 3-bit segment. Thus, in a 13-bit pattern constructed of (I₁₂, I₁₁, I₁₀, I₉, I₈, I₇, I₆, I₅, I₄, I₃, I₂, I₁, I₀) the string (I₁₂, I₁₁, I₁₀) cannot equal “000”. Given this simplified mapping, the input values are then converted into an output string O₁₂-O₀ according to table 5 below: TABLE 5 I₁₂ D 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 I₁₁ C 0 !0 !0 !0 φ 1 !0 !0 !0 0 0 0 0 0 !0 !0 φ φ !0 !0 I₁₀ 0 1 0 0 0 0 0 0 φ φ I₉ φ φ 0 !0 !0 !0 !0 φ φ 0 0 0 0 0 0 !0 !0 I₈ φ φ 0 φ φ 0 0 0 0 0 0 I₇ B φ 0 0 0 0 0 0 !0 !0 0 0 !0 0 !0 0 0 0 0 !0 !0 I₆ φ 0 0 0 0 0 0 0 0 !0 0 0 0 0 I₅ φ 0 0 0 0 0 0 0 0 φ 0 0 0 0 I₄ φ 0 0 0 0 0 0 0 0 φ 0 0 0 0 I₃ A φ 0 !0 0 0 0 !0 0 !0 0 !0 0 !0 !0 0 !0 0 !0 0 !0 I₂ φ 0 0 0 0 0 0 0 0 0 0 I₁ φ 0 φ 1 1 φ 0 0 0 0 !0 φ 0 I₀ φ 0 1 0 0 φ 0 0 0 0 φ 0 O₁₂ Z φ 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 O₁₁ Y φ 0 0 0 0 0 C 0 C 0 0 0 0 C 0 0 0 C 0 C O₁₀ φ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O₉ φ 1 1 1 1 1 1 1 1 1 1 1 1 1 0 O₈ φ 0 1 1 1 1 0 0 1 0 1 0 1 1 1 O₇ X φ C C 1 1 1 B B B 0 1 B B B C 0 1 B B B O₆ φ 0 0 0 0 0 1 1 O₅ φ A₁ C₃ 0 1 1 C₃ A₁ O₄ φ A₀ C₂ 1 1 0 C₂ A₀ O₃ W φ 0 A C 0 C₁ A C A 0 A 0 A A 0 A C A C A O₂ φ 0 0 C₀ 0 0 0 O₁ φ 1 C₁ 0 1 0 1 O₀ φ 1 C₀ 0 1 1 0

[0176] where “!0” indicates that none of the values are equal to zero and Φ indicates that the value of the bit does not matter.

[0177] Codewords encoded using the segment block encoding table of Table 5 can be decoded using table 6 below: TABLE 6 I₁₂ Z 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 I₁₁ Y 0 0 0 0 0 0 0 0 0 0 0 0 0 0 !0 φ I₁₀ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 φ I₉ 0 1 1 1 1 1 1 1 1 1 1 1 1 1 φ φ I₈ 1 0 0 0 0 0 1 1 1 1 1 1 1 1 φ φ I₇ X φ φ φ !0 0 φ 0 0 1 !0 1 1 1 1 φ φ I₆ φ φ φ 0 φ 0 1 1 0 0 0 0 φ φ I₅ φ φ φ φ 1 φ φ !0 !0 0 φ φ 0 1 φ φ I₄ φ φ φ φ 1 φ φ 0 1 1 1 0 φ φ I₃ W φ 0 0 0 0 !0 φ φ φ φ 0 !0 !0 φ φ φ I₂ φ 0 0 0 0 φ φ φ φ 0 φ φ φ I₁ φ 0 1 1 1 φ φ φ φ φ φ !0 0 φ φ φ I₀ φ 1 0 1 1 φ φ φ φ φ φ 0 φ φ φ O₁₂ D 1 1 1 0 1 0 1 1 1 0 0 0 0 1 0 1 O₁₁ C W 0 X X 0 W 0 X₁ W X X₁ W 1 0 Y Y O₁₀ 0 0 0 X₀ X₀ 0 0 O₉ 0 0 0 0 W₁ W₃ 0 O₈ 0 0 0 0 W₀ W₂ 0 O₇ B X X 0 0 0 X 0 0 0 0 0 0 0 0 X X O₆ 0 0 0 0 0 0 0 0 0 0 0 O₅ 0 0 0 X₁ 0 0 0 0 0 0 0 O₄ 0 0 0 X₀ 0 0 0 0 0 0 0 O₃ A 0 0 0 0 0 0 W W 0 W 0 0 0 W W W O₂ 0 0 0 0 0 0 0 0 0 0 O₁ 0 0 0 0 0 0 X₁ 1 X₁ 1 O₀ 0 0 0 0 0 0 X₀ 0 X₀ 0

[0178] where I₁₂-I₀ are the input values to the decoder and O₁₂-O₀ are the output decoded values from the decoder.

[0179] Note that the encoding of Table 5 is simplified because the simplified mapping unit has removed “000” as a possible value for the string (I₁₂, I₁₁, I₁₀). Because of this, many of the data words can be used directly as codewords because they do not violate the k constraint for the RLL code.

[0180] In alternative embodiments, the segment block encoder is formed to work in conjunction with the simplified mappings of Tables 2 and 3 above and the logic equations associated with those tables instead of the base 7 mapping.

[0181]FIG. 7 is a block diagram showing elements of such an encoder. In FIG. 7, the 13-bit data segment appears on a 13-bit line 700 that is input to a bit inverter 702 and an encoder 704. Bit inverter 702 generates two 13-bit outputs 706 and 708. Output 706 is identified by the letter N and output 708 is identified by the letter P. The operation of bit inverter 702 is described by the following logical equations where variables N0-N12 represent bits 0-12 of N output 706, variables P0-P12 represent bits 0 to 12 of P output 708, and variables D0-d12 represent bits 0-12 of D input 700. The operation of bit inverter 702 is thus described as:

[0182] N12=!D12

[0183] N11=!D11

[0184] N10=!D10

[0185] N9=!D9

[0186] N8=!D8

[0187] N7=!D7

[0188] N6=!D6

[0189] N5=!D5

[0190] N4=!D4

[0191] N3=!D3

[0192] N2=!D2

[0193] N1=!D1

[0194] N0=!D0

[0195] P12=0

[0196] P11=0

[0197] P10=0

[0198] P9=1

[0199] P8=N12

[0200] P7=N11

[0201] P6=N10

[0202] P5=N9

[0203] P4=N8

[0204] P3=N7

[0205] P2=N6

[0206] P1=N5

[0207] P0=N4

[0208] N output 706 of bit inverter 702 is provided to a codeword tester 710. Output values N12-N0 are represented as input values A12-A0 within code tester 710. P output values 708 of bit inverter 702 are provided to a code tester 712 that is identical to code tester 710. In code tester 712, values P12-P0 are represented as input values A12-A0. The operation of codeword testers 710 and 712 is represented by logical equations:

[0209] Input: A12, A11, A10, A9, A8, A7, A6, A5, A4, A3, A2, A1, A0 (13 bits)

[0210] Output: T UA0 = A12 | A11 | A10 | A9 | A8 UA1 = A11 | A10 | A9 | A8 | A7 | A6 | A5 UA2 = A10 | A9 | A8 | A7 | A6 | A5 | A4 UA3 = A9 | A8 | A7 | A6 | A5 | A4 | A3 UA4 = A8 | A7 | A6 | A5 | A4 | A3 | A2 UA5 = A7 | A6 | A5 | A4 | A3 | A2 | A1 UA6 = A3 | A2 | A1 | A0 {VA = A12+A11+A10+A9+A8+A7+A6+A5+A4+A3+A2+A1+A0 if (VA>3) UA7=1 else UA7=0 } T = UA0 & UA1 & UA2 & UA3 & UA4 & UA5 & UA6 & UA7

[0211] where T is the single bit output of the codeword tester. Output T of codeword tester 710 is provided to encoder 704 and appears as input TT in encoder 704. Output T of codeword tester 712 is also provided to encoder 704 and appears as input TP in encoder 704. Note that TP and TT are single bit inputs.

[0212] Encoder 704 uses the 13-bit input, D, and the single-bit inputs TP and TT to generate a 13-bit codeword 714. The operation of the encoder is described by the following logical equations where bits 0-12 of the codeword are represented by C0-C12:

[0213] Tn=!TT

[0214] Ha=TP & D3 & D2 & D1 & D0

[0215] Ha9=Ha

[0216] Ha8=Ha & N12

[0217] Ha7=Ha & N11

[0218] Ha6=Ha & N10

[0219] Ha5=Ha & N9

[0220] Ha4=Ha & N8

[0221] Ha3=Ha & N7

[0222] Ha2=Ha & N6

[0223] Ha1=Ha & N5

[0224] Ha0=Ha & N4

[0225] G1=(D11 & D10)|(D12 & (D11|D10))

[0226] Hb=!Ha & G1 & ((D2 & D1 & D0)|(D3 & ((D2 & (D1|D0))|(D1 & D0))))

[0227] Hb9=Hb & (!D10 & !D3)

[0228] Hb8=Hb & (D10|D3)

[0229] Hb7=Hb & (!D11|(D12 & D3))

[0230] Hb6=Hb & (!D12|(D11 & D3))

[0231] Hb5=Hb & D3

[0232] Hb4=Hb & (D2 & D0)

[0233] Hb3=Hb & (D2 & D1)

[0234] Hb2=Hb & (!D7|!D6|!D5|!D4)

[0235] Hb1=Hb & (D9 & D6 & D5)

[0236] Hb0=Hb & (D8 & D6 & D4)

[0237] Hc=!Ha & !Hb & D11 & D10

[0238] Hc9=0

[0239] Hc8=Hc

[0240] Hc7=0

[0241] Hc6=0

[0242] Hc5=Hc & (D9 & D4)

[0243] Hc4=Hc & !D4

[0244] Hc3=Hc & (!D9|!D3)

[0245] Hc2=Hc & (!D9|!D2)

[0246] Hc1=Hc & (D9 & |!D1)

[0247] Hc0=Hc & D0

[0248] Hd=!Ha & !Hb & D12 & (D11|D10)

[0249] Hd9=0

[0250] Hd8=Hd

[0251] Hd7=Hd & (D11 & D9)

[0252] Hd6=Hd & (D10 & D9)

[0253] Hd5=0

[0254] Hd4=0

[0255] Hd3=Hd & (!D9|!D3)

[0256] Hd2=Hd & (!D9|!D2)

[0257] Hd1=Hd & !D1

[0258] Hd0=Hd & (!D0 & (D11|D9))

[0259] G2=!G1 & !Ha

[0260] He=G2 & D3 & D2

[0261] He9=He & D12

[0262] He8=He & !D12

[0263] He7=He & (D11|D10)

[0264] He6=He & (D11|D10)

[0265] He5=He & (!D11 & !D10)

[0266] He4=He & !D10

[0267] He3=He & D8

[0268] He2=He & (D9|!D8)

[0269] He1=He & (D1 & (D9|D8))

[0270] He0=He & D0

[0271] Hf=G2 & !He & ((D12|D11)|(D3 & !D2))

[0272] Hf9=Hf & !D3

[0273] Hf8=Hf & D3

[0274] Hf7=Hf & (D3 & (D12|D11))

[0275] Hf6=Hf & (!D12 & !D11)

[0276] Hf5=Hf & (!D12 & !D3)

[0277] Hf4=Hf & D3

[0278] Hf3=Hf & (!D12 & !D10 & !D1 & |!D0)

[0279] Hf2=Hf & (D12|D10 !D3)

[0280] Hf1=Hf & D1

[0281] Hf0=Hf & D0

[0282] Hg=G2 & !He & !Hf & (!D12|!D11)

[0283] Hg9=Hg & (D1 & !D2)

[0284] Hg8=Hg & (D2|!D1)

[0285] Hg7=Hg & D2

[0286] Hg6=Hg & D2

[0287] Hg5=Hg & !D2

[0288] Hg4=Hg & (D1|!D2)

[0289] Hg3=0

[0290] Hg2=0

[0291] Hg1=Hg

[0292] Hg0=Hg & D0

[0293] C12=(TT & N12)

[0294] C11=(TT & N11)

[0295] C10=(TT & N10)

[0296] C9=(TT & N9)|(Tn & (Ha9|Hb9 Hc9|Hd9|He9|Hf9|Hg9))

[0297] C8=(TT & N8)|(Tn & (Ha8|Hb8|Hc8|Hd8|He8|Hf8|Hg8))

[0298] C7=(TT & N7)|(Tn & (Ha7|Hb7|Hc7|Hd7|He7|Hf7|Hg7))

[0299] C6=(TT & N6)|(Tn & (Ha6|Hb6|Hc6|Hd6|He6|Hf6|Hg6))

[0300] C5=(TT & N5)|(Tn & (Ha5|Hb5|Hc5|Hd5|He5|Hf5|Hg5))

[0301] C4=(TT & N4)|(Tn & (Ha4|Hb4|Hc4|Hd4|He4|Hf4|Hg4))

[0302] C3=(TT & N3)|(Tn & (Ha3|Hb3|Hc3|Hd3|He3|Hf3|Hg3))

[0303] C2=(TT & N2)|(Tn & (Ha2|Hb2|Hc2|Hd2|He2|Hf2|Hg2))

[0304] C1=(TT & N1)|(Tn & (Ha1|Hb1|Hc1|Hd1|He1|Hf1|Hg1))

[0305] C0=(TT & N0)|(Tn & (Ha0|Hb0|Hc0|Hd0|He0|Hf0|Hg0))

[0306] Codewords encoded using the logical equations described above may be decoded using the following logical equations where the input to the decoder is represented by bits C0-C12, the output of the decoder is represented by D0-D12, and a flag output indicative of an invalid codeword is represented by F. Thus, the segment decoder is described in logical equations as:

[0307] TT=C12|C11|C10

[0308] Tn=!TT

[0309] N12=!C12

[0310] N11=!C11

[0311] N10=!C10

[0312] N9=!C9

[0313] N8=!C8

[0314] N7=!C7

[0315] N6=!C6

[0316] N5=!C5

[0317] N4=!C4

[0318] N3=!C3

[0319] N2=!C2

[0320] N1=!C1

[0321] N0=!C0

[0322] Ha=Tn & ((C9 & C8)|(C9 & (C7|C6)))

[0323] Ha12=Ha & N8

[0324] Ha11=Ha & N7

[0325] Ha10=Ha & N6

[0326] Ha9=Ha & N5

[0327] Ha8=Ha & N4

[0328] Ha7=Ha & N3

[0329] Ha6=Ha & N2

[0330] Ha5=Ha & N1

[0331] Ha4=Ha & N0

[0332] Ha3=Ha

[0333] Ha2=Ha

[0334] Ha1=Ha

[0335] Ha0=Ha

[0336] Hb=Tn & !Ha & (((C7|C6) & C5) ((C9|(C7^ C6)) & !C5 & C4 & C3 & (C2|C1|C0)))

[0337] Hb12=Hb & (C9|C7)

[0338] Hb11=Hb & (C9|C6)

[0339] Hb10=Hb & (C7^ C6)

[0340] Hb9=Hb & (C2|C1)

[0341] Hb8=Hb & (C2|C0)

[0342] Hb7=Hb & (!C2|!C1|!C0)

[0343] Hb6=Hb & (C1|C0|!C2)

[0344] Hb5=Hb & (C1|!C2|!C0)

[0345] Hb4=Hb & (C0|!C2|!C1)

[0346] Hb3=Hb & C5

[0347] Hb2=Hb & (C4|C3)

[0348] Hb1=Hb & (C3|!C4)

[0349] Hb0=Hb & (C4|!C3)

[0350] Hc=Tn & !Ha & C8 & !C7 & !C6 & ((C5^ C4)|(!C5 & !C4 & !C1))

[0351] Hc12=0

[0352] Hc11=Hc

[0353] Hc10=Hc

[0354] Hc9=Hc & (C5|C4)

[0355] Hc8=Hc

[0356] Hc7=Hc

[0357] Hc6=Hc

[0358] Hc5=Hc

[0359] Hc4=Hc & !C4

[0360] Hc3=Hc & (!C3|(!C5 & !C4))

[0361] Hc2=Hc & (!C2|(!C5 & !C4))

[0362] Hc1=Hc & (!C1 & (C5|C4))

[0363] Hc0=Hc & !C0

[0364] Hd=Tn & !Ha & C8 & !C5 & !C4 & ((C7^ C6)|(!C7 & !C6 & C3 & C2 & C1))

[0365] Hd12=Hd

[0366] Hd11=Hd & (C7|(C0 & !C6))

[0367] Hd10=Hd & (C6|(!C7 & !C0))

[0368] Hd9=Hd & (C7|C6)

[0369] Hd8=Hd

[0370] Hd7=Hd

[0371] Hd6=Hd

[0372] Hd5=Hd

[0373] Hd4=Hd

[0374] Hd3=Hd & (!C3|(!C7 & !C6))

[0375] Hd2=Hd & (!C2|(!C7 & !C6))

[0376] Hd1=Hd & !C1

[0377] Hd0=Hd & (!C0 & (C7|C6))

[0378] He=Tn & !Ha & !Hb & !Hc & ((C7 & C6)|(C5 & C4)) & (C3|C2)

[0379] He12=He & C9

[0380] He11=He & (C7 & C4)

[0381] He10=He & !C4

[0382] He9=He & (C2 & (C3|C1))

[0383] He8=He & C3

[0384] He7=He

[0385] He6=He

[0386] He5=He

[0387] He4=He

[0388] He3=He

[0389] He2=He

[0390] He1=He & (C1|!C3)

[0391] He0=He & C0

[0392] Hf=Tn & !Ha & !Hb & !Hc & !Hd & !He & ((C9 & !C8 & !C4)|((C7^ C6) & !C5 & C4))

[0393] Hf12=Hf & (C2 & !C6 & !C5)

[0394] Hf11=Hf & (C5|(C7 & !C2))

[0395] Hf10=Hf & (C6 & C2)

[0396] Hf9=Hf

[0397] Hf8=Hf

[0398] Hf7=Hf

[0399] Hf6=Hf

[0400] Hf5=Hf

[0401] Hf4=Hf

[0402] Hf3=Hf & !C9

[0403] Hf2=Hf & C9

[0404] Hf1=Hf & C1

[0405] Hf0=Hf & C0

[0406] Hg=Tn & !Ha & !Hb & !Hc & !Hd & !He & !Hf & ((C7 & C6) (C5 & C4))

[0407] Hg12=0

[0408] Hg11=0

[0409] Hg10=Hg

[0410] Hg9=Hg

[0411] Hg8=Hg

[0412] Hg7=Hg

[0413] Hg6=Hg

[0414] Hg5=Hg

[0415] Hg4=Hg

[0416] Hg3=0

[0417] Hg2=Hg & C7

[0418] Hg1=Hg & (C9|(C7 & C4))

[0419] Hg0=Hg & C0

[0420] F=(Tn & !Ha & !Hb & !Hc & !Hd & !He & !Hf & !Hg)

[0421] D12=(TT & N12)|(Tn & (Ha12|Hb12|Hc12|Hd12|He12|Hf12|Hg12))

[0422] D11=(TT & N11)|(Tn & (Ha11|Hb11|Hc11|Hd11|He11|Hf11|Hg11))

[0423] D10=(TT & N10)|(Tn & (Ha10|Hb10|Hc10|Hd10|He10|Hf10|Hg10))

[0424] D9=(TT & N9)|(Tn & (Ha9|Hb9|Hc9|Hd9|He9|Hf9|Hg9))

[0425] D8=(TT & N8)|(Tn & (Ha8|Hb8|Hc8|Hd8|He8|Hf8|Hg8))

[0426] D7=(TT & N7)|(Tn & (Ha7|Hb7|Hc7|Hd7|He7|Hf7|Hg7))

[0427] D6=(TT & N6)|(Tn & (Ha6|Hb6|Hc6|Hd6|He6|Hf6|Hg6))

[0428] D5=(TT & N5)|(Tn & (Ha5|Hb5|Hc5|Hd5|He5|Hf5|Hg5))

[0429] D4=(TT & N4)|(Tn & (Ha4|Hb4|Hc4|Hd4|He4|Hf4|Hg4))

[0430] D3=(TT & N3)|(Tn & (Ha3|Hb3|Hc3|Hd3|He3|Hf3|Hg3))

[0431] D2=(TT & N2)|(Tn & (Ha2|Hb2|Hc2|Hd2|He2|Hf2|Hg2))

[0432] D1=(TT & N1)|(Tn & (Ha1|Hb1|Hc1|Hd1|He1|Hf1|Hg1))

[0433] D0=(TT & N0)|(Tn & (Ha0|Hb0|Hc0|Hd0|He0|Hf0|Hg0))

[0434] The encoder and decoders described above by logical equations can be summarized by the following codeword table where the first column of the table indicates the first two hexadecimal digits of the data word and the last hexadecimal digit of the data word is found across the top row of each table. The codeword associated with the complete data word is then found by finding the intersection of the first two hexadecimal values for the data word and the third hexadecimal value for the data word. For example, the data word 0F7 has an associated codeword of 1F08 in the following tables. TABLE 7 13-bit code words for 64/65 (0,7) code [Min Hwt = 4] 0 1 2 3 4 5 6 7 00X 1FFF 1FFE 1FED 1FFC 1FFB 1FFA 1FF9 1FF8 01X 1FEF 1FEE 1FED 1FEC 1FEB 1FEA 1FE9 1FE8 02X 1FDF 1FDE 1FDD 1FDC 1FDB 1FDA 1FD9 1FDB 03X 1FCF 1FCE 1FCD 1FDC 1FCB 1FCA 1FC9 1FC8 04X 1FBF 1FBE 1FBD 1FBC 1FBB 1FBA 1FB9 1FB8 05X 1FAF 1FAE 1EAD 1FAC 1FAB 1FAA 1FA9 1FAB 06X 1F9F 1F9E 1F9D 1F9C 1F9B 1F9A 1F99 1F98 07X 1F8F 1F8E 1F8D 1F8C 1F8B 1EBA 1F89 1F88 08X 1F7F 1F7E 1F7D 1F7C 1F7B 1F7A 1F79 1F78 09X 1F6F 1F6E 1F6D 1F6C 1F6B 1F6A 1F69 1F68 0AX 1F5F 1F5E 1F5D 1F5C 1F5B 1F5A 1F59 1F58 0BX 1F4F 1F4E 1F4D 1F4C 1F4B 1F4A 1F49 1F48 0CX 1F3F 1F3E 1F3D 1F3C 1F3B 1F3A 1F39 1F38 0DX 1F2F 1F2E 1F2D 1F2C 1F2B 1F2A 1F29 1F28 0EX 1F1F 1F1E 1F1D 1F1C 1F1B 1F1A 1F19 1F18 0FX 1F0F 1F0F 1F0D 1F0C 1F0B 1F0A 1F09 1F08 10X 1EFF 1EFE 1EFD 1EFC 1EFB 1EFA 1EF9 1EF8 11X 1EEF 1EEE 1EED 1EEC 1EEB 1EEA 1EE9 1EE8 12X 1EDE 1EDE 1EDD 1EDC 1EDB 1EDA 1ED9 1ED8 13X 1ECF 1ECE 1ECD 1ECC 1EDB 1ECA 1EC9 1EC8 14X 1EBF 1EBE 1EBD 1EBC 1EBB 1EBA 1EB9 1EB8 15X 1EAF 1EAE 1EAD 1EAC 1EAB 1EAA 1EA9 1EA8 16X 1E9F 1E9E 1E9D 1E9C 1E9B 1E9A 1E99 1E98 17X 1E8F 1E8E 1E8D 1E8C 1E8B 1E8A 1E89 1E88 18X 1E7F 1E7E 1E7D 1E7C 1E7B 1E7A 1E79 1E78 19X 1E6F 1E6E 1E6D 1E6C 1E6B 1E6A 1E69 1E68 1AX 1E5F 1E5E 1E5D 1E5C 1E5B 1E5A 1E59 1E58 1BX 1E4F 1E4E 1E40 1E4C 1E4B 1E4A 1E49 1E48 1CX 1E3F 1E3E 1E3D 1E3C 1E3B 1E3A 1E39 1E38 1DX 1E2F 1E2E 1E2D 1E2C 1E2B 1E2A 1E29 1E28 1EX 1E1F 1E1E 1E1D 1E10 1E1B 1E1A 1E19 1E18 1FX 1E0F 1F0E 1F0D 1F0C 1F0B 1F0A 1F09 1E08 20X 1DFF 1DFE 1DFD 1DFC 1DFB 1DFA 1DF9 1DF8 21X 1DEF 1DEE 1DED 1DED 1DEB 1DEA 1DE9 1DE8 22X 1DDE 1DDE 1DDD 1DDC 1DDB 1DDA 1DD9 1DD8 23X 1DCF 1DCE 1DCD 1DCC 1DCB 1DCA 1DC9 1DC8 24X 1DBF 1DCE 1DBD 1DBC 1DBB 1DBA 1DB9 1DB8 25X 1DAF 1DAE 1DAD 1DAC 1DAB 1DAA 1DA9 1DA8 26X 1D9F 1D9E 1D9D 1D9C 1D9B 1D9A 1D99 1D98 27X 1D8F 1D8E 1D8D 1D8C 1D8B 1D8A 1D89 1D88 28X 1D7F 1D7E 1D7D 1D7C 1D7B 1D7A 1D79 1D78 29X 1D6F 1D6E 1D6D 1D6C 1D6B 1D6A 1D69 1D68 2AX 1D5F 1D5E 1D5D 1D5C 1D5B 1D5A 1D59 1D58 2BX 1D4F 1D4E 1D4D 1D4C 1D4B 1D4A 1D49 1D48 2CX 1D3F 1D3E 1D3D 1D3C 1D3B 1D3A 1D39 1D38 2DX 1D2F 1D2E 1D2D 1D2C 1D2B 1D2A 1D29 1D28 2EX 1D0F 1D1E 1D1D 1D1C 1D1B 1D1A 1D19 1D18 2FX 1D0F 1D0E 1D0D 1D0C 1D0B 1D0A 1D09 1D08 30X 1CFF 1DFE 1DFD 1DFC 1DFB 1DFA 1CF9 1CF8 31X 1CEF 1CEE 1CED 1CEC 1CEB 1CEA 1CE9 1CE8 32X 1CDF 1CDE 1CDD 1CDC 1CDB 1CDA 1CD9 1CD8 33X 1CCF 1CCE 1CCD 1CCC 1CCB 1CCA 1CC9 1CC8 34X 1CBF 1CBE 1CBD 1CBC 1CBB 1CBA 1CB9 1CB8 35X 1CAF 1CAE 1CAD 1CAC 1CAB 1CAA 1CA9 1CAB 36X 1C9F 1C9E 1C9D 1C9C 1C9B 1C9A 1C99 1C98 37X 1C8F 1CBE 1C8D 1C8C 1C8B 1C8A 1C89 1C88 38X 1C7F 1C7E 1C7D 1C7C 1C7B 1C7A 1C79 1C78 39X 1C6F 1C6E 1C6D 1C6C 1C6B 1C6A 1C69 1C68 3AX 1C5F 1C5E 1C5D 1C5C 1C5B 1C5A 1C59 1C58 3BX 1C4E 1C4E 1C4D 1C4C 1C4B 1C4A 1C49 1C48 3CX 1C3F 1C3E 1C3D 1C3C 1C3B 1C3A 1C39 1C38 3DX 1C2E 1C2E 1C2D 1C2C 1C2B 1C2A 1C29 1C28 3EX 1C1F 1C1E 1C1D 1C1C 1C1B 1C1A 1C19 1C18 3FX 1C0F 1C0E 1C0D 1C0C 1C0B 1C0A 1C09 1C08 8 9 A B C D E F 00X 1FF7 1FF6 1FF5 1FF4 1FF3 1FF2 1FF1 03FF 01X 1FE7 1FE6 1FE5 1FE4 1FE3 1FE2 1FE1 03FE 02X 1FD7 1FD6 1FD5 1FD4 1FD3 1FD2 1FD1 03FD 03X 1FC7 1FC6 1FC5 1FC4 1FC3 1FC2 1FC1 03FC 04X 1FB7 1FB6 1FB6 1FB4 1FB3 1FB2 1FB1 03FB 05X 1FA7 1FA6 1FA5 1FA4 1FA3 1FA2 1FA1 03FA 06X 1F97 1F96 1F95 1F94 1F93 1F92 1F91 03F9 07X 1F87 1F86 1F85 1F84 1F83 1F82 1F81 03F8 08X 1F77 1F76 1F75 1F74 1F73 1F72 1F71 03F7 09X 1F67 1F66 1F65 1F64 1F63 1F62 1F61 03F6 0AX 1F57 1F56 1F55 1F54 1F53 1F52 1F51 03F5 0BX 1F47 1F46 1F45 1F44 1F43 1F42 1F41 03F4 0CX 1F37 1F36 1F35 1F34 1F33 1F32 1F31 03F3 0DX 1F27 1F26 1F25 1F24 1F23 1F22 1F21 03F2 0EX 1F17 1F16 1F15 1F14 1F13 1F12 1F11 03F1 0FX 1F07 1F06 1F05 1F04 1F03 1F02 0134 0135 10X 1EF7 1EF6 1EF5 1EF4 1EF3 1EF2 1EF1 03EF 11X 1EE7 1EE6 1EE5 1EE4 1EE3 1EE2 1EE1 03EE 12X 1ED7 1ED6 1ED5 1ED4 1ED3 1ED2 1ED1 03ED 13X 1EC7 1EC6 1EC5 1EC4 1EC3 1EC2 1EC1 03EC 14X 1EB7 1EB6 1EB5 1EB4 1EB3 1EB2 1EB1 03EB 15X 1EA7 1EA6 1EA5 1EA4 1EA3 1EA2 1EA1 03EA 16X 1E97 1E96 1E95 1E94 1E93 1E92 1E91 03E9 17X 1E87 1E86 1E85 1E84 1E83 1E82 1E81 03E8 18X 1E77 1E76 1E75 1E74 1E73 1E72 1E71 03E7 19X 1E67 1E66 1E65 1E64 1E63 1E62 1E61 03E6 1AX 1E57 1E56 1E55 1E54 1E53 1E52 1E51 03E5 1BX 1E47 1E46 1E45 1E44 1E43 1E42 1E41 03E4 1CX 1E37 1E36 1E35 1E34 1E33 1E32 1E31 03E3 1DX 1E27 1E26 1E25 1E24 1E23 1E22 1E21 03E2 1EX 1E17 1E16 1E15 1E14 1E13 1E12 1E11 03E1 1FX 1E07 1E06 1E05 1E04 0138 0139 013A 013B 20X 1DF7 1DF6 1DF5 1DF4 1DF3 1DF2 1DF1 03DF 21X 1DE7 1DE6 1DE5 1DE4 1DE3 1DE2 1DE1 03DE 22X 1DD7 1DD6 1DD5 1DD4 1DD3 1DD2 1DD1 03DD 23X 1DC7 1DC6 1DC5 1DC4 1DC3 1DC2 1DC1 03DC 24X 1DB7 1DB6 1DB5 1DB4 1DB3 1DB2 1DB1 03DB 25X 1DA7 1DA6 1DA5 1DA4 1DA3 1DA2 1DA1 03DA 26X 1D97 1D96 1D95 1D94 1D93 1D92 1D91 03D9 27X 1D87 1D86 1D85 1D84 1D83 1D82 1D81 03D8 28X 1D77 1D76 1D75 1D74 1D73 1D72 1D71 03D7 29X 1D67 1D66 1D65 1D64 1D63 1D62 1D61 03D6 2AX 1D57 1D56 1D55 1D54 1D53 1D52 1D51 03D5 2BX 1D47 1D46 1D45 1D44 1D43 1D42 1D41 0304 2CX 1D37 1D36 1D35 1D34 1D33 1D32 1D31 0303 2DX 1D27 1D26 1D25 1D24 1D23 1D22 1D21 0302 2EX 1D17 1D16 1D15 1D14 1D13 1D12 1D11 0301 2FX 1D07 1D06 1D05 1D04 1D03 1D02 0136 0137 30X 1CF7 1CF6 1CF5 1CF4 1CF3 1CF2 1CF1 03CF 31X 1CE7 1CE6 1CE5 1CE4 1CE3 1CE2 1CE1 03CE 32X 1CD7 1CD6 1CD5 1CD4 1CD3 1CD2 1CD1 03CD 33X 1CC7 1CC6 1CC5 1CC4 1CC3 1CC2 1CC1 03CC 34X 1CB7 1CB6 1CB5 1CB4 1CB3 1CB2 1CB1 03CB 35X 1CA7 1CA6 1CA5 1CA4 1CA3 1CA2 1CA1 03CA 36X 1C97 1C96 1C95 1C94 1C93 1C92 1C91 03C9 37X 1C87 1C86 1C85 1C84 1C83 1C82 1C81 03C8 38X 1C77 1C76 1C75 1C74 1C73 1C72 1C71 03C7 39X 1C67 1C66 1C65 1C64 1C63 1C62 1C61 03C6 3AX 1C57 1C56 1C55 1C64 1C53 1C52 1C51 03C5 3BX 1C47 1C46 1C45 1C44 1C43 1C42 1C41 03C4 3CX 1C37 1C36 1C35 1C34 1C33 1C32 1C31 03C3 3DX 1C27 1C26 1C25 1C24 1C23 1C22 1C21 03C2 3EX 1C17 1C16 1C15 1C14 1C13 1C12 1C11 03C1 3FX 0158 0151 0152 0153 013C 013D 013E 013F

[0435] TABLE 8 13-bit code words for 64/65 (0,7) code [Min Hwt = 4] 0 1 2 3 4 5 6 7 40X 1BFF 1BFE 1BFD 1BFC 1BFB 1BFA 1BF9 1BF8 41X 1BEF 1BEE 1BED 1BEC 1BEB 1BEA 1BE9 1BE8 42X 1BDF 1BDE 1BDD 1BDC 1BDB 1BDA 1BD9 1BD8 43X 1BCF 1BCE 1BCD 1BCC 1BCB 1BCA 1BC9 1BC8 44X 1BBF 1BBE 1BBD 1BBC 1BBB 1BBA 1BB9 1BB8 45X 1BAF 1BAE 1BAD 1BAC 1BAB 1BAA 18A9 1BA8 46X 1B9F 1B9E 1B9D 1B9C 1B9B 1B9A 1B99 1B98 47X 1B8F 188E 1B8D 1B8C 1B8B 1B8A 1B89 1B88 48X 1B7F 1B7E 1B7D 1B7C 1B7B 1B7A 1B79 1B78 49X 1B6F 1B6E 1B6D 1B6C 1B6B 1B8A 1B69 1B68 4AX 1B5F 1B5E 1B5D 1B5C 1B5B 1B5A 1B59 1B58 4BX 1B4F 1B4E 1B4D 1B4C 1B4B 1B4A 1B49 1B48 4CX 1B3F 1B3E 1B3C 1B3C 1B3B 1B3A 1B39 1B38 4DX 1B2F 1B2E 1B2D 1B2C 1B2B 1B2A 1B29 1B28 4EX 1B1F 1B1E 1B1D 1B1C 1B1B 1B1A 1B19 1B18 4FX 1B0F 1B0E 1B0D 1B0C 1B0B 1B0A 1B09 1B08 50X 1AFF 1AFE 1AFD 1AFC 1AFB 1AFA 1AF9 1AF8 51X 1AEF 1AEE 1AED 1AEC 1AEB 1AEA 1AE9 1AE8 52X 1ADF 1ADE 1ADD 1ADC 1ADB 1ADA 1AD9 1AD8 53X 1ACE 1ACE 1ACD 1ACC 1ACB 1ACA 1AC9 1AC8 54X 1ABF 1ABE 1ABD 1ABC 1ABB 1ABA 1AB9 1AB8 55X 1AAF 1AAE 1AAD 1AAC 1AAB 1AAA 1AA9 1AA8 56X 1A9F 1A9E 1A9D 1A9C 1A9B 1A9A 1A99 1A98 57X 1A8F 1A8E 1A8D 1A8C 1A8B 1A8A 1A89 1A88 58X 1A7F 1A7E 1A7D 1A7C 1A7B 1A7A 1A79 1A78 59X 1A8F 1A6E 1A6D 1A6C 1A6B 1A6A 1A69 1A68 5AX 1A5F 1A5E 1A5D 1A5C 1A5B 1A5A 1A59 1A58 5BX 1A4F 1A4E 1A4D 1A4C 1A48 1A4A 1A49 1A48 5CX 1A3F 1A3E 1A3D 1A3C 1A3B 1A3A 1A39 1A38 5DX 1A2F 1A2E 1A2D 1A2C 1A2B 1A2A 1A29 1A28 5EX 1A1F 1A1E 1A1D 1A1C 1A1B 1A1A 1A19 1A1B 5FX 1A0F 1A0E 1A0D 1A0C 1A0B 1A0A 1A09 1A08 60X 19FF 19FE 19FD 19FC 19FB 19FA 19F9 19F8 61X 19EF 19EE 19ED 19EC 19EB 19EA 19E9 19E8 62X 19DF 19DE 19DD 19DC 19DB 19DA 19D9 19D8 63X 19CF 19CE 19CD 19CC 19CB 19CA 19C9 19C8 64X 19BF 19BE 19BD 19BC 19BB 19BA 19B9 19B8 65X 19AF 19AE 19AD 19AC 19AB 19AA 19A9 19A8 66X 199F 199E 199D 199C 199B 199A 1999 1998 67X 198F 198E 198D 198C 198B 198A 1989 1988 68X 197F 197E 197D 197C 197B 197A 1979 1978 69X 196F 196E 196D 196C 196B 196A 1969 1968 6AX 195F 195E 195D 195C 195B 195A 1959 1958 6BX 194F 194E 194D 194C 194B 194A 1949 1948 6CX 193F 193E 193D 193C 193B 193A 1939 1938 6DX 192F 192E 192D 192C 192B 192A 1929 1928 6EX 191F 191E 191D 191C 191B 191A 1919 1918 6FX 190F 190E 190D 190C 190B 190A 1909 1908 70X 18FF 18FE 18FD 18FC 18FB 18FA 18F9 18F8 71X 18EF 18EE 18ED 18EC 18EB 18EA 18E9 18E8 72X 18DF 18DE 18DD 18DC 18DB 18DA 18D9 18D8 73X 18CF 18CE 18CD 18CC 18CB 18CA 18C9 18C8 74X 18BF 18BE 18BD 18BC 18BB 18BA 18B9 18B8 75X 18AF 18AE 18AD 18AC 18AB 18AA 18A9 18A8 76X 189F 189E 189D 189C 189B 189A 1899 1898 77X 188F 188E 188D 188C 188B 188A 1889 1888 78X 187F 187E 187D 187C 187B 187A 1879 1878 79X 186F 186E 186D 186C 186B 185A 1869 1868 7AX 185F 185E 185D 185C 185B 185A 1859 1858 7BX 184F 184E 184D 184C 184B 184A 1849 1848 7CX 183F 183E 183D 183C 183B 183A 1839 1838 7DX 182F 182E 182D 182C 182B 182A 1829 1828 7EX 181F 181E 181D 181C 181B 181A 1819 1818 7FX 0132 0133 0232 0233 01C2 01C3 01D2 01D3 8 9 A B C 0 E F 40X 1BF7 1BF6 1BF5 1BF4 1BF3 1BF2 1BF1 03BF 41X 1BE7 1BE6 1BE5 1BE4 1BE3 1BE2 1BE1 03BE 42X 1BD7 1BD6 1BD5 1BD4 1BD3 1BD2 1BD1 03BD 43X 1BC7 1BC6 1BC5 1BC4 1BC3 1BC2 1BC1 038C 44X 1BB7 1BB6 1BB5 1BB4 1BB3 1BB2 1BB1 03BB 45X 1BA7 1BA6 1BA5 1BA4 1BA3 1BA2 1BA1 03BA 46X 1B97 1B98 1B95 1B94 1B93 1B92 1B91 03B9 47X 1B87 1B86 1B85 1B84 1B83 1B82 1B81 03B8 48X 1B77 1B78 1B75 1B74 1B73 1B72 1B71 03B7 49X 1B67 1B66 1B85 1B64 1B63 1B62 1B61 03B6 4AX 1B57 1B56 1B55 1B54 1B53 1B52 1B51 03B5 4BX 1B47 1B46 1B45 1B44 1B43 1B42 1B41 03B4 4CX 1B37 1B36 1B35 1B34 1B33 1B32 1B31 03B3 4DX 1B27 1B26 1B25 1B24 1B23 1B22 1B21 03B2 4EX 1B17 1B16 1B15 1B14 1B13 1B12 1B11 03B1 4FX 1B07 1B06 1B05 1B04 1B03 1B02 01C4 01C5 50X 1AF7 1AF6 1AF5 1AF4 1AF3 1AF2 1AF1 03AF 51X 1AE7 1AE6 1AE5 1AE4 1AE3 1AE2 1AE1 03AE 52X 1AD7 1AD6 1AD5 1AD4 1AD3 1AD2 1AD1 03AD 53X 1AC7 1AC6 1AC5 1AC4 1AC3 1AC2 1AC1 03AC 54X 1AB7 1AB6 1AB5 1AB4 1AB3 1AB2 1AB1 03AB 55X 1AA7 1AA6 1AA5 1AA4 1AA3 1AA2 1AA1 03AA 56X 1A97 1A96 1A95 1A94 1A93 1A92 1A91 03A9 57X 1A87 1A86 1A85 1A84 1A83 1A82 1A81 03A8 58X 1A77 1A76 1A75 1A74 1A73 1A72 1A71 03A7 59X 1A67 1A66 1A65 1A64 1A63 1A62 1A61 03A5 5AX 1A57 1A56 1A55 1A54 1A53 1A52 1A51 03A5 5BX 1A47 1A46 1A45 1A44 1A43 1A42 1A41 03A4 5CX 1A37 1A36 1A35 1A34 1A33 1A32 1A31 03A3 5DX 1A27 1A26 1A25 1A24 1A23 1A22 1A21 03A2 5EX 1A17 1A16 1A15 1A14 1A13 1A12 1A11 03A1 5FX 1A07 1A06 1A05 1A04 01C8 01C9 01CA 01C8 60X 19F7 19F6 19F5 19F4 19F3 19F2 19F1 039F 61X 19E7 19E6 19E5 19E4 19E3 19E2 19E1 039E 62X 19D7 19D6 19D5 19D4 19D3 19D2 19D1 039D 63X 19C7 19C6 19C5 19C4 19C3 19C2 19C1 039C 64X 19B7 19B6 19B5 19B4 19B3 19B2 19B1 039B 65X 19A7 19A6 19A5 19A4 19A3 19A2 19A1 039A 66X 1997 1996 1995 1994 1993 1992 1991 0399 67X 1987 1986 1985 1984 1983 1982 1981 0398 68X 1977 1976 1975 1974 1973 1972 1971 0397 69X 1967 1966 1965 1964 1963 1962 1961 0396 6AX 1957 1956 1955 1954 1953 1952 1951 0395 6BX 1947 1946 1945 1944 1943 1942 1941 0394 6CX 1937 1938 1935 1934 1933 1932 1931 0393 6DX 1927 1926 1925 1924 1923 1922 1921 0392 6EX 1917 1916 1915 1914 1913 1912 1911 0391 6FX 1907 1906 1905 1904 1903 1902 01C6 01C7 70X 18F7 18F6 18F5 18F4 18F3 18F2 18F1 038F 71X 18E7 18E5 18E5 18E4 18E3 18E2 18E1 038E 72X 18D7 18D6 18D5 18D4 18D3 18D2 18D1 038D 73X 18C7 18C6 18C5 18C4 18C3 18C2 18C1 038C 74X 18B7 18B6 18B5 18B4 18B3 18B2 18B1 038B 75X 18A7 18A5 18A5 18A4 18A3 18A2 18A1 038A 76X 1897 1896 1895 1894 1893 1892 1891 0389 77X 1887 1886 1885 1884 1883 1882 1881 0388 78X 1877 1876 1875 1874 1873 1872 1871 0387 79X 1867 1866 1865 1864 1863 1862 1861 0386 7AX 1857 1856 1855 1854 1853 1852 1851 0385 7BX 1847 1846 1845 1844 1843 1842 1841 0384 7CX 1837 1836 1835 1834 1833 1832 1831 0383 7DX 1827 1826 1825 1824 1823 1822 1821 0382 7EX 1817 1816 1815 1814 1813 1812 1811 0381 7FX 0154 0155 0156 0157 01CC 01CD 01CE 01CF

[0436] TABLE 9 13-bit code words for 64/65 (0,7) code [Min Hwt = 4] 0 1 2 3 4 5 6 7 80X 17FF 17FE 17FD 17FC 17FB 17FA 17F9 17F8 81X 17EF 17EE 17ED 17EC 17EB 17EA 17E9 17E8 82X 17DF 17DE 17DD 17DC 17DB 17DA 17D9 17D8 83X 17CF 17CE 17CD 17CC 17CB 17CA 17C9 17C8 84X 17BF 17BE 17BD 17BC 17BB 17BA 17B9 17B8 85X 17AF 17AE 17AD 17AC 17AB 17AA 17A9 17A8 86X 179F 179E 179D 179C 179B 179A 1799 1798 87X 178F 178E 178D 178C 178B 178A 1789 1788 88X 177F 177E 177D 177C 177B 177A 1779 1778 89X 176F 176E 176D 176C 176B 176A 1769 1768 8AX 175F 175E 175D 175C 175B 175A 1759 1758 8BX 174F 174E 174D 174C 174B 174A 1749 1748 8CX 173F 173E 173D 173C 173B 173A 1739 1738 8DX 172F 172E 172D 172C 172B 172A 1729 1728 8EX 171F 171E 171D 171C 171B 171A 1719 1718 8FX 170F 170E 170D 170C 170B 170A 1709 1708 90X 16FF 16FE 16FD 16FC 16FB 16FA 16F9 16F8 91X 16EF 16EE 16ED 16EC 16EB 16EA 16E9 16E8 92X 16DF 16DE 16DD 16DC 16DB 16DA 16D9 16D8 93X 16CE 16CE 16CD 16CC 16CB 16CA 16C9 16C8 94X 16BF 16BE 16BD 16BC 16BB 16BA 16B9 16B8 95X 16AF 16AE 16AD 16AC 16AB 16AA 16A9 16A8 96X 169F 169E 169D 169C 169B 169A 1699 1698 97X 168F 168E 168D 168C 168B 168A 1689 1688 98X 167F 167E 167D 167C 167B 167A 1679 1678 99X 168F 166E 166D 166C 166B 166A 1669 1668 9AX 165F 165E 165D 165C 165B 165A 1659 1658 9BX 164F 164E 164D 164C 164B 164A 1649 1648 9CX 163F 163E 163D 163C 163B 163A 1639 1638 9DX 162F 162E 162D 162C 162B 162A 1629 1628 9EX 161F 161E 161D 161C 161B 161A 1619 1618 9FX 16DE 160E 160D 160C 160B 160A 1609 1608 A0X 15FF 15FE 15FD 15FC 15FB 15FA 15F9 15F8 A1X 15EF 15EE 15ED 15EC 15EB 15EA 15E9 15E8 A2X 15DF 15DE 15DD 15DC 15DB 15DA 15D9 15D8 A3X 15CF 15CE 15CD 15CC 15CB 15CA 15C9 15C8 A4X 15BF 15BE 15BD 15BC 15BB 15BA 15B9 15B8 A5X 15AF 15AE 15AD 15AC 15AB 15AA 15A9 15A8 A6X 159F 159E 159D 159C 159B 159A 1599 1598 A7X 158F 158E 158D 158C 158B 158A 1589 1588 A8X 157F 157E 157D 157C 157B 157A 1579 1578 A9X 156F 156E 156D 156C 156B 156A 1569 1568 AAX 155F 155E 155D 155C 155B 155A 1559 1558 ABX 154F 154E 154D 154C 154B 154A 1549 1548 ACX 153F 153E 153D 153C 153B 153A 1539 1538 ADX 152F 152E 152D 152C 152B 152A 1529 1528 AEX 151F 151E 151D 151C 151B 151A 1519 151B AFX 150F 150E 150D 150C 150B 150A 1509 1508 B0X 14FF 14FE 14FD 14FC 14FB 14FA 14F9 14F8 B1X 14EF 14EE 14ED 14EC 14EB 14EA 14E9 14E8 B2X 14DF 14DE 14DD 14DC 14DB 14DA 14D9 14D8 B3X 14CF 14CE 14CD 14CC 14CB 14CA 14C9 14C8 B4X 14BF 14BE 14BD 14BC 14BB 14BA 14B9 14B8 B5X 14AF 14AE 14AD 14AC 14AB 14AA 14A9 14A8 B6X 149F 149E 149D 149C 149B 149A 1499 1498 B7X 148F 148E 148D 148C 148B 148A 1489 1488 B8X 147F 147E 147D 147C 147B 147A 1479 1478 B9X 146F 145E 146D 146C 146B 145A 1469 1468 BAX 145F 145E 145D 145C 145B 145A 1459 1458 BBX 144F 144E 144D 144C 144B 144A 1449 1448 BCX 143F 143E 143D 143C 143B 143A 1439 1438 BDX 142F 142E 142D 142C 142B 142A 1429 1428 BEX 141F 141E 141D 141C 141B 141A 1419 1418 BFX 140F 140E 140D 140C 140B 140A 1409 0227 8 9 A B C 0 E F 80X 17F7 17F6 17F5 17F4 17F3 17F2 17F1 037F 81X 17E7 17E6 17E5 17E4 17E3 17E2 17E1 037E 82X 17D7 17D6 17D5 17D4 17D3 17D2 17D1 037D 83X 17C7 17C6 17C5 17C4 17C3 17C2 17C1 037C 84X 17B7 17B6 17B5 17B4 17B3 17B2 17B1 037B 85X 17A7 17A6 17A5 17A4 17A3 17A2 17A1 037A 86X 1797 1798 1795 1794 1793 1792 1791 0379 87X 1787 1786 1785 1784 1783 1782 1781 0378 88X 1777 1778 1775 1774 1773 1772 1771 0377 89X 1767 1766 1765 1764 1763 1762 1761 0376 8AX 1757 1756 1755 1754 1753 1752 1751 0375 8BX 1747 1746 1745 1744 1743 1742 1741 0374 8CX 1737 1736 1735 1734 1733 1732 1731 0373 8DX 1727 1726 1725 1724 1723 1722 1721 0372 8EX 1717 1716 1715 1714 1713 1712 1711 0371 8FX 1707 1706 1705 1704 1703 1702 01D4 01D5 90X 16F7 16F6 16F5 16F4 16F3 16F2 16F1 036F 91X 16E7 16E6 16E5 16E4 16E3 16E2 16E1 036E 92X 16D7 16D6 16D5 16D4 16D3 16D2 16D1 036D 93X 16C7 16C8 16C5 16C4 16C3 16C2 16C1 036C 94X 16B7 16B6 16B5 16B4 16B3 16B2 16B1 036B 95X 16A7 16A6 16A5 16A4 16A3 16A2 16A1 036A 96X 1697 1696 1695 1694 1693 1692 1691 0369 97X 1687 1686 1685 1684 1683 1682 1681 0368 98X 1677 1676 1675 1674 1673 1672 1671 0367 99X 1667 1666 1665 1664 1663 1662 1661 0366 9AX 1657 1656 1655 1654 1653 1652 1651 0365 9BX 1647 1646 1645 1644 1643 1642 1641 0364 9CX 1637 1636 1635 1634 1633 1632 1631 0363 9DX 1627 1626 1625 1624 1623 1622 1621 0362 9EX 1617 1616 1615 1614 1613 1612 1611 0361 9FX 1607 1606 1605 1604 01D8 01D9 01DA 01DB A0X 15F7 15F6 15F5 15F4 15F3 15F2 15F1 035F A1X 15E7 15E6 15E5 15E4 15E3 15E2 15E1 035E A2X 15D7 15D6 15D5 15D4 15D3 15D2 15D1 035D A3X 15C7 15C6 15C5 15C4 15C3 15C2 15C1 035C A4X 15B7 15B6 15B5 15B4 15B3 15B2 15B1 035B A5X 15A7 15A6 15A5 15A4 15A3 15A2 15A1 035A A6X 1597 1596 1595 1594 1593 1592 1591 0359 A7X 1587 1586 1585 1584 1583 1582 1581 0358 A8X 1577 1576 1575 1574 1573 1572 1571 0357 A9X 1567 1566 1565 1564 1563 1562 1561 0356 AAX 1557 1556 1555 1554 1553 1552 1551 0355 ABX 1547 1546 1545 1544 1543 1542 1541 0354 ACX 1537 1538 1535 1534 1533 1532 1531 0353 ADX 1527 1526 1525 1524 1523 1522 1521 0352 AEX 1517 1516 1515 1514 1513 1512 1511 0351 AFX 1507 1506 1505 1504 1503 1502 01D6 01D7 B0X 14F7 14F6 14F5 14F4 14F3 14F2 14F1 034F B1X 14E7 14E5 14E5 14E4 14E3 14E2 14E1 034E B2X 14D7 14D6 14D5 14D4 14D3 14D2 14D1 034D B3X 14C7 14C6 14C5 14C4 14C3 14C2 14C1 034C B4X 14B7 14B6 14B5 14B4 14B3 14B2 14B1 034B B5X 14A7 14A5 14A5 14A4 14A3 14A2 14A1 034A B6X 1497 1496 1495 1494 1493 1492 1491 0349 B7X 1487 1486 1485 1484 1483 1482 1481 0348 B8X 1477 1476 1475 1474 1473 1472 1471 0347 B9X 1467 1466 1465 1464 1463 1462 1461 0346 BAX 1457 1456 1455 1454 1453 1452 1451 0345 BBX 1447 1446 1445 1444 1443 1442 1441 0344 BCX 1437 1436 1435 1434 1433 1432 1431 0343 BDX 1427 1426 1425 1424 1423 1422 1421 0342 BEX 1417 1416 1415 1414 1413 1412 1411 0341 BFX 0198 0191 0192 0193 01DC 01DD 01DE 01DF

[0437] TABLE 10 13-bit code words for 64/65 (0,7) code [Min Hwt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

[0438] TABLE 11 13-bit code words for 64/65 (0,7) code [Min Hwt = 4] 0 1 2 3 4 5 6 7 100X 0FFF 0FFE 0FED 0FFC 0FFB 0FFA 0FF9 0FF8 101X 0FEF 0FEE 0FED 0FEC 0FEB 0FEA 0FE9 0FE8 102X 0FDF 0FDE 0FDD 0FDC 0FDB 0FDA 0FD9 0FDB 103X 0FCF 0FCE 0FCD 0FDC 0FCB 0FCA 0FC9 0FC8 104X 0FBF 0FBE 0FBD 0FBC 0FBB 0FBA 0FB9 0FB8 105X 0FAF 0FAE 0EAD 0FAC 0FAB 0FAA 0FA9 0FAB 106X 0F9F 0F9E 0F9D 0F9C 0F9B 0F9A 0F99 0F98 107X 0F8F 0F8E 0F8D 0F8C 0F8B 0F8A 0F89 0F88 108X 0F7F 0F7E 0F7D 0F7C 0F7B 0F7A 0F79 0F78 109X 0F6F 0F6E 0F6D 0F6C 0F6B 0F6A 0F69 0F68 10AX 0F5F 0F5E 0F5D 0F5C 0F5B 0F5A 0F59 0F58 10BX 0F4F 0F4E 0F4D 0F4C 0F4B 0F4A 0F49 0F48 10CX 0F3F 0F3E 0F3D 0F3C 0F3B 0F3A 0F39 0F38 10DX 0F2F 0F2E 0F2D 0F2C 0F2B 0F2A 0F29 0F28 10EX 0F0F 0F0E 0F1D 0F1C 0F1B 0F1A 0F19 0F18 10FX 0F0F 0F0F 0F0D 0F0C 0F0B 0F0A 0F09 0F08 110X 0EFF 0EFE 0EFD 0EFD 0EEB 0EFA 0EF9 IEF8 111X 0EEF 0EEE 0EED 0EEC 0EEB 0EEA 0EE9 0EE8 112X 0EDE 0EDE 0EDD 0EDC 0EDB 0EDA 0ED9 0EDB 113X 0EDF 0ECE 0ECD 0ECC 0ECB 0ECA 0EC9 0EC8 114X 0EBF 0EBE 0EBD 0EBC 0EBB 0EBA 0EB9 0EB8 115X 0EAF 0EAE 0EAD 0EAC 0EAB 0EAA 0EA9 0EAB 116X 0E9F 0E9E 0E9D 0E9C 0E9B 0E9A 0E99 0E98 117X 0E8F 0E8E 0E8D 0E8C 0E8B 0E8A 0E89 0E88 118X 0E7F 0E7E 0E7D 0E7C 0E7B 0E7A 0E79 0E78 119X 0E6F 0EGE 0E6D 0E6C 0E6B 0EGA 0E69 0E68 11AX 0E5F 0E5E 0E5D 0E5C 0E5B 0E5A 0E59 0E58 11BX 0E4F 0E4E 0E40 0E4C 0E4B 0E4A 0E49 0E48 11CX 0E3F 0E3E 0E3D 0E3C 0E3B 0E3A 0E39 0E38 11DX 0E2F 0E2E 0E2D 0E2C 0E2B 0E2A 0E29 0E28 11EX 0E0F 0E0E 0E1D 0E1C 0E1B 0E1A 0E19 0E18 11FX 0E0F 0E0E 0E0D 0E0C 0E0B 0E0A 0E09 0E08 120X 0DFF 0DFE 0DFD 0DFC 0DFB 0DFA 0DF9 0DF8 121X 0DEF 0DEE 0DED 0DED 0DEB 0DEA 0DE9 0DE8 122X 0DDE 0DDE 0DDD 0DDC 0DDB 0DDA 0DD9 0DD8 123X 0DCF 0DCE 0DCD 0DCC 0DCB 0DCA 0DC9 0DC8 124X 0DBF 0DCE 0DBD 0DBC 0DBB 0DBA 0DB9 0DB8 125X 0DAF 0DAE 0DAD 0DAC 0DAB 0DAA 0DA9 0DA8 126X 0D9F 0D9E 0D9D 0D9C 0D9B 0D9A 0D99 0D98 127X 0D8F 0D8E 0D8D 0D8C 0D8B 0D8A 0D89 0D88 128X 0D7F 0D7E 0D7D 0D7C 0D7B 0D7A 0D79 0D78 129X 0D6F 0D5E 0D6D 0D6C 0D6B 0D6A 0D69 0D68 12AX 0D5F 0D5E 0D5D 0D5C 0D5B 0D5A 0D59 0D58 12BX 0D4F 0D4E 0D4D 0D4C 0D4B 0D4A 0D49 0D48 12CX 0D3F 0D3E 0D3D 0D3C 0D3B 0D3A 0D39 0D38 12DX 0D2F 0D2E 0D2D 0D2C 0D2B 0D2A 0D29 0D28 12EX 0D0F 0D0E 0D0D 0D1C 0D1B 0D1A 0D19 0D18 12FX 0D0F 0D0E 0D0D 0D0C 0D0B 0D0A 0D09 0D08 130X 0CFF 0CFE 0CFD 0CFD 0CFB 0CFA 0CF9 0CF8 131X 0CEF 0CEE 0CED 0CEC 0CEB 0CEA 0CE9 0CE8 132X 0CDF 0CDE 0CDD 0CDC 0CDB 0CDA 0CD9 0CD8 133X 0CCF 0CCE 0CCD 0CCC 0CCB 0CCA 0CC9 0CC8 134X 0CBF 0CBE 0CBD 0CBC 0CBB 0CBA 0CB9 0CB8 135X 0CAF 0CAE 0CAD 0CAC 0CAB 0CAA 0CA9 0CA8 136X 0C9F 0C9E 0C9D 0C9C 0C9B 0C9A 0C99 0C98 137X 0C8F 0C8E 0C8D 0C8C 0C8B 0CBA 0C89 0C88 138X 0C7F 0C7E 0C7D 0C7C 0C7B 0C7A 0C79 0C78 139X 0C6F 0C6E 0C6D 0C6C 0C6B 0C6A 0C69 0C68 13AX 0C5F 0C5E 0C5D 0C5C 0C5B 0C5A 0C59 0C58 13BX 0C4E 0C4E 0C4D 0C4C 0C4B 0C4A 0C49 0C48 13CX 0C3F 0C3E 0C3D 0C3C 0C3B 0C3A 0C39 0C38 13DX 0C2E 0C2E 0C2D 0C2C 0C2B 0C2A 0C29 0C28 13EX 0C0F 0C0E 0C0D 0C0C 0C1B 0C1A 0C19 0C18 13FX 0C0F 0C0E 0C0D 0C0C 0C0B 0C0A 0C09 0C08 8 9 A B C D E F 100X 0FF7 0FF6 0FF5 0FF4 0FF3 0FF2 0FF1 03FF 101X 0FE7 0FE6 0FE5 0FE4 0FE3 0FE2 0FE1 03FE 102X 0FD7 0FD6 0FD5 0FD4 0FD3 0FD2 0FD1 03FD 103X 0FC7 0FC6 0FC5 0FC4 0FC3 0FC2 0FC1 03FC 104X 0FB7 0FB6 0FB6 0FB4 0FB3 0FB2 0FB1 03FB 105X 0FA7 0FA6 0FA5 0FA4 0FA3 0FA2 0FA1 03FA 106X 0F97 0F96 0F95 0F94 0F93 0F92 0F91 03F9 107X 0F87 0F86 0F85 0F84 0F83 0F82 0F81 03F8 108X 0F77 0F76 0F75 0F74 0F73 0F72 0F71 03F7 109X 0F67 0F66 0F65 0F64 0F63 0F62 0F61 03F6 10AX 0F57 0F56 0F55 0F54 0F53 0F52 0F51 03F5 10BX 0F47 0F46 0F45 0F44 0F43 0F42 0F41 03F4 10CX 0F37 0F36 0F35 0F34 0F33 0F32 0F31 03F3 10DX 0F27 0F26 0F25 0F24 0F23 0F22 0F21 03F2 10EX 0F17 0F16 0F15 0F14 0F13 0F12 0F11 03F1 10FX 0F07 0F06 0F05 0F04 0F03 0F02 0234 0235 110X 0EF7 0EF6 0EF5 0EF4 0EF3 0EF2 0EF1 03EF 111X 0EE7 0EE6 0EE5 0EE4 0EE3 0EE2 0EE1 03EE 112X 0ED7 0ED6 0ED5 0ED4 0ED3 0ED2 0ED1 03ED 113X 0EC7 0EC6 0EC5 0EC4 0EC3 0EC2 0EC1 03EC 114X 0EB7 0EB6 0EB5 0EB4 0EB3 0EB2 0EB1 03EB 115X 0EA7 0EA6 0EA5 0EA4 0EA3 0EA2 0EA1 03EA 116X 0E97 0E96 0E95 0E94 0E93 0E92 0E91 03E9 117X 0E87 0E86 0E85 0E84 0E83 0E82 0E81 03E8 118X 0E77 0E76 0E75 0E74 0E73 0E72 0E71 03E7 119X 0E67 0E66 0E65 0E64 0E63 0E62 0E61 03E6 11AX 0E57 0E56 0E55 0E54 0E53 0E52 0E51 03E5 11BX 0E47 0E46 0E45 0E44 0E43 0E42 0E41 03E4 11CX 0E37 0E36 0E35 0E34 0E33 0E32 0E31 03E3 11DX 0E27 0E26 0E25 0E24 0E23 0E22 0E21 03E2 11EX 0E17 0E16 0E15 0E14 0E13 0E12 0E11 03E1 11FX 0E07 0E06 0E05 0E04 0238 0239 023A 023B 120X 0DF7 0DF6 0DF5 0DF4 0DF3 0DF2 0DF1 03DF 121X 0DE7 0DE6 0DE5 0DE4 0DE3 10E2 0DE1 03DE 122X 0DD7 0DD6 0DD5 0DD4 0DD3 0DD2 0DD1 03DD 123X 0DC7 0DC6 0DC5 0DC4 0DC3 0DC2 0DC1 03DC 124X 0DB7 0DB6 0DB5 0DB4 0DB3 0DB2 0DB1 03DB 125X 0DA7 0DA6 0DA5 0DA4 0DA3 0DA2 0DA1 03DA 126X 0D97 0D96 0D95 0D94 0D93 0D92 0D91 03D9 127X 0D87 0D86 0D85 0D84 0D83 0D82 0D81 03DB 128X 0D77 0D76 0D75 0D74 0D73 0D72 0D71 03D7 129X 0D67 0D66 0D65 0D64 0D63 0D62 0D61 03D6 12AX 0D57 0D56 0D55 0D54 0D53 0D52 0D51 03D5 12BX 0D47 0D46 0D45 0D44 0D43 0D42 0D41 0304 12CX 0D37 0D36 0D35 0D34 0D33 0D32 0D31 0303 12DX 0D27 0D26 0D25 0D24 0D23 0D22 0D21 0302 12EX 0D17 0D16 0D15 0D14 0D13 0D12 0D11 0301 12FX 0D07 0D06 0D05 0D04 0D03 0D02 0136 0137 130X 0CF7 0CF6 0CF5 0CF4 0CF3 0CF2 0CF1 03CF 131X 0CE7 0CE6 0CE5 0CE4 0CE3 0CE2 0CE1 03CE 132X 0CD7 0CD6 0CD5 0CD4 0CD3 0CD2 0CD1 03CD 133X 0CC7 0CC6 0CC5 0CC4 0CC3 0CC2 0CC1 03CC 134X 0CB7 0CB6 0CB5 0C64 0CB3 0CB2 0CB1 03CB 135X 0CA7 0CA6 0CA5 0CA4 0CA3 0CA2 0CA1 03CA 136X 0C97 0C96 0C95 0C94 0C93 0C92 0C91 03C9 137X 0C87 0C86 0C85 0C84 0C83 0C82 0C81 03C8 138X 0C77 0C76 0C75 0C74 0C73 0C72 0C71 03C7 139X 0C67 0C66 0C65 0C64 0C63 0C62 0C61 03C6 13AX 0C57 0C56 0C55 0C64 0C53 0C52 0C51 03C5 13BX 0C47 0C46 0C45 0C44 0C43 0C42 0C41 03C4 13CX 0C37 0C36 0C35 0C34 0C33 0C32 0C31 03C3 13DX 0C27 0C26 0C25 0C24 0C23 0C22 0C21 03C2 13EX 0C17 0C16 0C15 0C14 0C13 0C12 0C11 03C1 13FX 0194 0195 0196 0197 023C 023D 023E 023F

[0439] TABLE 12 13-bit code words for 64/65 (0,7) code [Min Hwt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

[0440] TABLE 13 13-bit code words for 64/65 (0,7) code [Min Hwt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

[0441] Although the encoder and decoder described above have been described with reference to a rate 64/65 encoder, any rate may be used with appropriate changes to the simplified mapping and the segment block encoders. For example, a 99/100 rate encoder can be constructed by separating the 99 bits of the data word into a 14-bit segment and an 85-bit segment. The 14-bit segment is then mapped into five 3-bit segments using the same process as described above. The 85-bit segment is divided into five 17-bit subsegments. These subsegments are combined with the 3-bit segments to form five 20-bit segments that are then encoded by a 20 bit to 20 bit encoder. The resulting code segments are concatenated to form the 100-bit codeword.

[0442]FIG. 8 provides a block diagram of one embodiment of a segment encoder for encoding 20-bit data segments into 20-bit code segments. In FIG. 8, each 20-bit data segment 800 is divided into an 8-bit segment 802 and a 12-bit segment 804. The 12-bit segment is further divided into two 6-bit segments 806 and 808.

[0443] Eight-bit section 802 is mapped into two 4-bit sections 810 and 812 by a mapping unit 814. Under one embodiment, this mapping is performed by representing the 8-bit value as a base 15 number, where 4-bit value 810 and 812 are each binary representations of base-15 digits.

[0444] One of the embodiments of the mapping performed by mapping unit 814 can be summarized by: TABLE 14 I₇ I₆ I₅ I₄ I₃ I₂ I₁ I₀ G₃ G₂ G₁ G₀ F₃ F₂ F₁ F₀ 0 0 0 φ φ φ φ φ φ φ φ φ φ φ φ φ !0 φ 0 0 0 0 0 0 0 1 I₇ I₆ I₅ I₄ !0 φ !0 I₇ I₆ I₅ I₄ I₃ I₂ I₀ I₀

[0445] Where I7-I0 represents the 8-bit input segment G3-G0 represents one 4-bit output segment and F3-F0 represents another output segment. Note that the mapping in Table 14 assumes that a simplified mapping unit such as simplified mapping unit 516 has been used to designate input bits I7, I6, and I5 and that the simplified mapping unit will not set (I7, I6, I5) equal to “000”.

[0446] Four-bit section 810 is combined with 6-bit section 806 to form a 10-bit segment 816 that is input to a 10-bit encoder 818. Similarly, 4-bit section 812 is combined with 6-bit section 808 to form a 10-bit section 820 that is input to 10-bit encoder 822. Ten-bit encoders 818 and 822 are identical and each generates a 10-bit code section. The two 10-bit code sections are combined to form a 20-bit code segment 824.

[0447] Under one embodiment that works with the mapping of table 14, each 10-bit encoder converts the 10-bit data segments into 10-bit codeword sub-segments as found in Table 15 below: TABLE 15 I₉ I₈ I₇ I₆ I₅ I₄ I₃ I₂ I₁ I₀ O₉ O₈ O₇ O₆ O₅ O₄ O₂ O₂ O₁ O₀ φ 0 0 0 1 φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ !0 φ 0 0 0 0 0 1 0 0 0 0 I₉ I₈ I₇ I₆ I₅ !0 φ !0 I₅ I₉ I₈ I₇ I₆ I₄ I₃ I₂ I₁ I₀

[0448] In table 15, the 10-bit word input to the encoder is designated by bits I9-I0 and the 10-bit output word is designated by bits O9-O0. In table 15 input bits I9-I6 are provided by mapping unit 814.

[0449]FIG. 9 provides a block diagram of a 20-bit segment decoder that performs the inverse of the encoding operation performed by the encoder of FIG. 8. In FIG. 9, a 20-bit codeword segment 900 is divided into two 10-bit codeword sub-segments 902 and 904. The two 10-bit codeword sub-segments are provided to 10-bit decoders 906 and 908, respectively, which decode the sub-segments using an inverse function of the encoding function applied by encoders 818 and 822 of FIG. 8. The 10-bit decoded values 910 and 912 provided by the decoders are each separated into a 4-bit segment and a 6-bit segment. The two 4-bit segments 914 and 916 are provided to an inverse mapping unit 918 that provides an inverse of the mapping provided by mapping unit 814 of FIG. 8. This results in an 8-bit output section 920.

[0450] The two 6-bit values that are split off from 10-bit decoded values 910 and 912 are combined to form a 12-bit value 922 that is then combined with 8-bit section 920 to form a 20-bit data segment 924.

[0451] In the embodiments discussed above, the segment block encoders and decoders operate in a parallel fashion. In other embodiments, the segment block encoders operate in a sequential fashion. Under such embodiments, a single segment block encoder is used repeatedly to encode the entire data word.

[0452]FIG. 10 provides a block diagram of such a sequential encoder. Table 16 below shows a timing table that illustrates the location of certain values within the encoder during different parts of the encoding process. TABLE 16 SIGNAL ASSIGNMENT BY ENCODING CYCLE ENCODING CYCLE 1 2 3 4 X SM_IN D_(n-1):D_(p) SE_IN D_(p-1): D_(p(1-1/x)-1): D_(p(1-2/x)-1): D_(p(1-3/x)-1): D_(p(1-(x-1)/x)-1): D_(p(1-1/x)) D_(p(1-2/x)) D_(p(1-3/x)) D_(p(1-4/x)) D₀ MUX_OUT A B C D X SE_OUT CSA CSB CSC CSD CSX

[0453] Where p equals the number of bits (n-SM) not provided to simplified mapping unit 1002 and the designation D_(s):D_(e) represents the bits spanning from starting bit D_(s) to ending bit D_(e).

[0454] As shown in FIG. 10 and Table 16, during a first encoding cycle, a first section 1000 of the data word is applied to a simplified mapping unit 1002. In FIG. 10 and table 16, the number of bits applied to simplified mapping unit 1002 is represented generically by “SM”. Using the simplified mapping units described above, SM would be equal to 14.

[0455] Simplified mapping unit 1002 maps the SM bits at its input into x sections that each have (SM+1)/x bits. Each of the sections is output in parallel as shown by output lines 1004, 1006, 1008, 1010, and 1012, which are also designated as A, B, C, D, and X in Table 16.

[0456] The parallel outputs provided by simplified mapping unit 1002 are input to a multiplexer 1014, which selects a different one of the parallel inputs as its output at each encoding cycle. The output of multiplexer 1014 is shown as output 1016, which is provided to a segment encoder 1018. The value on output 1016 is shown in Table 16 in the row identified as MUX_OUT.

[0457] During the first encoding cycle, segment encoder 1018 also receives the next (n-SM)/x bits in the input data word where n is the number of total bits in the data word, SM is the number of bits provided to the simplified mapping, and x is the number of encoding cycles. This input is provided to encoder 1018 along encoding line 1020.

[0458] Given the values on encoder input lines 1016 and 1020, encoder 1018 generates a single codeword during the first encoding cycle. Since encoder input line 1016 has (SM+1)/x bits and encoder input line 1020 has (n-SM)/x bits, the total number of input bits is equal to (n+1)/x. Thus, segment encoder 1018 is encoding an (n+1)/x data segment into an (n+1)/x codeword segment. As such, any of the segment encoders described above may be used as segment encoder 1018.

[0459] With the production of the codeword, designated as CSA in Table 16, the first encoding cycle is complete and the second encoding cycle may begin. During the second encoding cycle, the next (n-SM)/x bits in the data word is applied to encoder 1018 along encoding line 1020. At the same time, multiplexer 1014 passes the value on input line 1006 to its output 1016. Using the values on input lines 1016 and 1020, encoder 1018 then encodes this value to produce a codeword designated as CSB in Table 16.

[0460] This process of sequentially encoding the data word continues until the last (n-SM)/x bits in the data word and the last parallel output of simplified mapping unit 1002 have been applied to encoder 1018 to produce a codeword segment. In Table 16, this last encoding step is shown as encoding cycle x.

[0461] An additional aspect of the present invention is a sequential decoder that provides an inverse of the mapping provided by the sequential encoder of FIG. 10. FIG. 11 provides a block diagram of such a sequential decoder. In FIG. 11, each codeword is divided into x segments with each segment having (n+1)/x bits. During a first decoding cycle, the first (n+1)/x bits appear on input line 1100 as input to a segment decoder 1102. Segment decoder 1102 provides an inverse of the coding function provided by segment encoder 1018 of FIG. 10.

[0462] Segment decoder 1102 divides the resulting decoded data segment into a first section 1104 having (SM+1)/x bits and a second section 1106 having (n-SM)/x bits.

[0463] The (SM+1)/x bits on line 1104 is provided to a multiplexer 1108 which routes the bits to an appropriate output line based on the current decoding cycle. In FIG. 11, five decoding lines 1110, 1112, 1114, 1116, and 1118 are shown that each carry (SM+1)/x bits. At each decoding cycle, multiplexer 1108 places the output from segment decoder 1102 on a different one of the output lines. Thus, after an entire codeword has been provided to segment decoder 1102, each of the output lines from multiplexer 1108 has carried a portion of a decoded segment.

[0464] With each decoding cycle, segment decoder 1102 produces a different portion of the data word on output line 1106. Under one embodiment, these individual portions of the data word are stored for later combination with the remaining portions of the data word before any further operations are performed on these decoded portions. In other embodiments, additional operations are performed on the individual portions of the data word before the entire data word has been decoded.

[0465] Once the entire codeword has been decoded by segment decoder 1102, inverse simplified mapping unit 1120 converts the values it has received on inputs 1110, 1112, 1114, 1116, and 1118 into a section 1122 of the data word having SM bits. The inverse mapping performed by inverse simplified mapping unit 1120 is the inverse of the mapping performed by mapping unit 1002 of FIG. 10. In one embodiment, section 1122 is then combined with the remaining portions of the data word to form a complete data word.

[0466] Note that the sequential encoder of FIG. 10 does not require that a sequential decoder be used to decode the codewords. A parallel decoder may be used to decode the codewords. Similarly, the sequential decoder of FIG. 11 may be used to decode codewords that have been formed by a parallel encoder.

[0467] The sequential encoder and decoder of FIGS. 10 and 11 may be used to encode and decode data words and codewords of any size. In one embodiment of the present invention, the sequential encoder was used to encode 64-bit data words into 65-bit codewords. In other embodiments, the sequential encoder is used to encode 99-bit data words into 100-bit codewords.

[0468] In summary, a method of encoding data words 300 into code words 334 is provided. The method includes mapping the data words 300 into a number of data segments 304, 306, 308, 310, and 312, each data segment having a number of bits equal to the number of bits in a codeword 334 (n+1) divided by the number (x) of data segments 304, 306, 308, 310, and 312. Each data segment 304, 306, 308, 310, and 312 is then encoded into a codeword segment 324, 326, 328, 330, and 332 having the same number of bits as the data segment. The codeword segments 324, 326, 328, 330, and 332 are then concatenated to form the codeword.

[0469] A decoder 168 is also provided for a disc drive 100. The decoder 168 decodes codewords 400 into data words 434 and includes at least one segment decoder 412, 414, 416, 418, and 420 for decoding each of a plurality of equally sized segments 402, 404, 406, 408, and 410 of the codeword 400. The decoding performed by segment decoder 412, 414, 416, 418 and 420 results in a plurality of data segments 422, 424, 426, 428, and 430 that are each the same size as the codeword segments. An inverse mapping unit 432 maps the plurality of data segments 422, 424, 426, 428, and 430 into a single data word 434.

[0470] It is to be understood that even though numerous characteristics and advantages of various embodiments of the invention have been set forth in the foregoing description, together with details of the structure and function of various embodiments of the invention, this disclosure is illustrative only, and changes may be made in detail, especially in matters of structure and arrangement of parts within the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. For example, the particular elements may vary depending on the particular application for the read channel while maintaining substantially the same functionality without departing from the scope and spirit of the present invention. In addition, although the preferred embodiment described herein is directed to a read channel for a disc drive system, it will be appreciated by those skilled in the art that the teachings of the present invention can be applied to other systems, like communication systems or other storage systems, without departing from the scope and spirit of the present invention. 

What is claimed is:
 1. A method of encoding data words into codewords, the method comprising steps of: (a) mapping the data words into a number of data segments, each data segment having a number of bits equal to the number of bits in a codeword divided by the number of data segments; (b) encoding each data segment into a codeword segment having the same number of bits as the data segment; and (c) concatenating the codeword segments together to form the codeword.
 2. The method of claim 1 wherein each codewords has one more bit than its respective data words.
 3. The method of claim 1 wherein mapping step (a) comprises: (a) (1) dividing each data word into a simplified mapping section and a number of passthrough sections, the number of passthrough sections equaling the number of data segments; (a)(2) mapping the simplified mapping section into a number of mapped sections, the number of mapped sections equaling the number of data segments; and (a)(3) combining each mapped section with a passthrough section to form a data segment.
 4. The method of claim 3 wherein mapping step (a)(2) comprises limiting each mapped section to having values found in just a subset of all possible values for the mapped section.
 5. The method of claim 4 wherein each mapped section has the same number of bits as all other mapped sections.
 6. The method of claim 4 wherein mapping step (a)(2) comprises converting the simplified mapping section from being represented by a plurality of base two digits to being represented by a plurality of mapped digits that have a base that is different than two, wherein each mapped section is a binary representation of a mapped digit.
 7. The method of claim 6 wherein each mapped digit is a binary representation of a base seven number.
 8. The method of claim 1 wherein encoding step (b) comprises encoding the data segments in parallel using a number of identical encoders that is equal to the number of data segments.
 9. The method of claim 1 wherein encoding step (b) comprises encoding the data segments sequentially using a single encoder.
 10. The method of claim 1 wherein encoding step (b) comprises encoding the data segments such that the codeword meets at least one Run Length Limited code constraint.
 11. The method of claim 1 wherein encoding step (b) further comprises steps of: (b)(1) dividing the data segments into a number of direct sections and a remapping section; (b)(2) remapping the remapping section into a number of remappped sections, the number of remapped sections equaling the number of direct sections; (b)(3) combining each remapped section with a direct section to form a number of combined sections; (b)(4) encoding each combined section to form an encoded section; and (b)(5) combining the encoded sections to form the code segment.
 12. The method of claim 1 wherein the method forms part of a process of passing data through a channel, the process further comprising: detecting the codewords after the codewords pass through the channel; and decoding the codewords into data words.
 13. In a disc drive, a decoder for decoding codewords into data words, the decoder comprising: at least one segment decoder for decoding each of a plurality of equally sized segments of the codeword to form a plurality of data segments each being the same size as the codeword segments; and an inverse mapping unit that maps the plurality of data segments into a single data word.
 14. The decoder of claim 13 wherein the inverse mapping unit comprises a simplified inverse mapping unit that combines a portion of each data segment together as a single input and that maps the single input to a single output having one less bit than the single input.
 15. The decoder of claim 13 wherein the at least one segment decoder comprises a plurality of identical segment decoders that operate in parallel.
 16. The decoder of claim 13 wherein the at least one segment decoder comprises a single segment decoder that sequentially decodes the codeword segments into data segments.
 17. The decoder of claim 13 wherein valid decoded data segments are limited to a subset of all possible values that could by represented by the bits of the data segment.
 18. The decoder of claim 13 wherein the segment decoder comprises: at least one smaller decoder for decoding each of a plurality of smaller portions of the code segment to form intermediate data portions; and a second inverse mapping unit that combines a part of each intermediate data portion as a single input value and that maps the single input value into a portion of the data segment.
 19. A disc drive for reading data from tracks along a disc, the disc drive comprising: a read head that is positionable over a track and is capable of generating a read signal; and decoding means coupled to the read head for decoding codewords represented by the read signal to produce data words.
 20. A method of decoding codewords into data words, the method comprising: (a) dividing each codeword into codeword segments; (b) decoding each codeword segment into a data segment having the same number of bits; and (c) inverse mapping the data segments into a single data word. 